tuna.js

/*
    Copyright (c) 2012 DinahMoe AB

    Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation
    files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy,
    modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software
    is furnished to do so, subject to the following conditions:

    The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
    DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
    OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
//Originally written by Alessandro Saccoia, Chris Coniglio and Oskar Eriksson
(function (window) {
    var userContext, userInstance, Tuna = function (context) {
            if (! window.AudioContext) {
                window.AudioContext = window.webkitAudioContext;
            }

            if(!context) {
                console.log("tuna.js: Missing audio context! Creating a new context for you.");
                context = window.AudioContext && (new window.AudioContext());
            }
            userContext = context;
            userInstance = this;
        },
        version = "0.2",
        set = "setValueAtTime",
        linear = "linearRampToValueAtTime",
        pipe = function (param, val) {
            param.value = val;
        },
        Super = Object.create(null, {
            activate: {
                writable: true,
                value: function (doActivate) {
                    if(doActivate) {
                        this.input.disconnect();
                        this.input.connect(this.activateNode);
                        if(this.activateCallback) {
                            this.activateCallback(doActivate);
                        }
                    } else {
                        this.input.disconnect();
                        this.input.connect(this.output);
                    }
                }
            },
            bypass: {
                get: function () {
                    return this._bypass;
                },
                set: function (value) {
                    if(this._lastBypassValue === value) {
                        return;
                    }
                    this._bypass = value;
                    this.activate(!value);
                    this._lastBypassValue = value;
                }
            },
            connect: {
                value: function (target) {
                    this.output.connect(target);
                }
            },
            disconnect: {
                value: function (target) {
                    this.output.disconnect(target);
                }
            },
            connectInOrder: {
                value: function (nodeArray) {
                    var i = nodeArray.length - 1;
                    while(i--) {
                        if(!nodeArray[i].connect) {
                            return console.error("AudioNode.connectInOrder: TypeError: Not an AudioNode.", nodeArray[i]);
                        }
                        if(nodeArray[i + 1].input) {
                            nodeArray[i].connect(nodeArray[i + 1].input);
                        } else {
                            nodeArray[i].connect(nodeArray[i + 1]);
                        }
                    }
                }
            },
            getDefaults: {
                value: function () {
                    var result = {};
                    for(var key in this.defaults) {
                        result[key] = this.defaults[key].value;
                    }
                    return result;
                }
            },
            automate: {
                value: function (property, value, duration, startTime) {
                    var start = startTime ? ~~ (startTime / 1000) : userContext.currentTime,
                        dur = duration ? ~~ (duration / 1000) : 0,
                        _is = this.defaults[property],
                        param = this[property],
                        method;

                    if(param) {
                        if(_is.automatable) {
                            if(!duration) {
                                method = set;
                            } else {
                                method = linear;
                                param.cancelScheduledValues(start);
                                param.setValueAtTime(param.value, start);
                            }
                            param[method](value, dur + start);
                        } else {
                            param = value;
                        }
                    } else {
                        console.error("Invalid Property for " + this.name);
                    }
                }
            }
        }),
        FLOAT = "float",
        BOOLEAN = "boolean",
        STRING = "string",
        INT = "int";

    function dbToWAVolume(db) {
        return Math.max(0, Math.round(100 * Math.pow(2, db / 6)) / 100);
    }

    function fmod(x, y) {
        // http://kevin.vanzonneveld.net
        // +   original by: Onno Marsman
        // +      input by: Brett Zamir (http://brett-zamir.me)
        // +   bugfixed by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
        // *     example 1: fmod(5.7, 1.3);
        // *     returns 1: 0.5
        var tmp, tmp2, p = 0,
            pY = 0,
            l = 0.0,
            l2 = 0.0;

        tmp = x.toExponential().match(/^.\.?(.*)e(.+)$/);
        p = parseInt(tmp[2], 10) - (tmp[1] + '').length;
        tmp = y.toExponential().match(/^.\.?(.*)e(.+)$/);
        pY = parseInt(tmp[2], 10) - (tmp[1] + '').length;

        if(pY > p) {
            p = pY;
        }

        tmp2 = (x % y);

        if(p < -100 || p > 20) {
            // toFixed will give an out of bound error so we fix it like this:
            l = Math.round(Math.log(tmp2) / Math.log(10));
            l2 = Math.pow(10, l);

            return(tmp2 / l2).toFixed(l - p) * l2;
        } else {
            return parseFloat(tmp2.toFixed(-p));
        }
    }

    function sign(x) {
        if(x === 0) {
            return 1;
        } else {
            return Math.abs(x) / x;
        }
    }

    function tanh(n) {
        return(Math.exp(n) - Math.exp(-n)) / (Math.exp(n) + Math.exp(-n));
    }

    function initValue(userVal, defaultVal) {
        return userVal === undefined ? defaultVal : userVal;
    }

    Tuna.prototype.Filter = function (properties) {
        if(!properties) {
            properties = this.getDefaults();
        }
        this.input = userContext.createGain();
        this.activateNode = userContext.createGain();
        this.filter = userContext.createBiquadFilter();
        this.output = userContext.createGain();

        this.activateNode.connect(this.filter);
        this.filter.connect(this.output);

        this.frequency = properties.frequency || this.defaults.frequency.value;
        this.Q = properties.resonance || this.defaults.Q.value;
        this.filterType = initValue(properties.filterType, this.defaults.filterType.value);
        this.gain = initValue(properties.gain, this.defaults.gain.value);
        this.bypass = properties.bypass || false;
    };
    Tuna.prototype.Filter.prototype = Object.create(Super, {
        name: {
            value: "Filter"
        },
        defaults: {
            writable:true,
            value: {
                frequency: {
                    value: 800,
                    min: 20,
                    max: 22050,
                    automatable: true,
                    type: FLOAT
                },
                Q: {
                    value: 1,
                    min: 0.001,
                    max: 100,
                    automatable: true,
                    type: FLOAT
                },
                gain: {
                    value: 0,
                    min: -40,
                    max: 40,
                    automatable: true,
                    type: FLOAT
                },
                bypass: {
                    value: true,
                    automatable: false,
                    type: BOOLEAN
                },
                filterType: {
                    value:"lowpass",
                    automatable: false,
                    type: STRING
                }
            }
        },
        filterType: {
            enumerable: true,
            get: function () {
                return this.filter.type;
            },
            set: function (value) {
                this.filter.type = value;
            }
        },
        Q: {
            enumerable: true,
            get: function () {
                return this.filter.Q;
            },
            set: function (value) {
                this.filter.Q.value = value;
            }
        },
        gain: {
            enumerable: true,
            get: function () {
                return this.filter.gain;
            },
            set: function (value) {
                this.filter.gain.value = value;
            }
        },
        frequency: {
            enumerable: true,
            get: function () {
                return this.filter.frequency;
            },
            set: function (value) {
                this.filter.frequency.value = value;
            }
        }
    });
    Tuna.prototype.Bitcrusher = function (properties) {
        if(!properties) {
            properties = this.getDefaults();
        }
        this.bufferSize = properties.bufferSize || this.defaults.bufferSize.value;

        this.input = userContext.createGain();
        this.activateNode = userContext.createGain();
        this.processor = userContext.createScriptProcessor(this.bufferSize, 1, 1);
        this.output = userContext.createGain();

        this.activateNode.connect(this.processor);
        this.processor.connect(this.output);

        var phaser = 0, last = 0, input, output, step, i, length;
        this.processor.onaudioprocess = function (e) {
            input = e.inputBuffer.getChannelData(0),
            output = e.outputBuffer.getChannelData(0),
            step = Math.pow(1/2, this.bits);
            length = input.length;
            for(i = 0; i < length; i++) {
                phaser += this.normfreq;
                if(phaser >= 1.0) {
                    phaser -= 1.0;
                    last = step * Math.floor(input[i] / step + 0.5);
                }
                output[i] = last;
            }
        };

        this.bits = properties.bits || this.defaults.bits.value;
        this.normfreq = initValue(properties.normfreq, this.defaults.normfreq.value);
        this.bypass = properties.bypass || false;
    };
    Tuna.prototype.Bitcrusher.prototype = Object.create(Super, {
        name: {
            value: "Bitcrusher"
        },
        defaults: {
            writable: true,
            value: {
                bits: {
                    value: 4,
                    min: 1,
                    max: 16,
                    automatable: false,
                    type: INT
                },
                bufferSize: {
                    value: 4096,
                    min: 256,
                    max: 16384,
                    automatable: false,
                    type: INT
                },
                bypass: {
                    value: false,
                    automatable: false,
                    type: BOOLEAN
                },
                normfreq: {
                    value: 0.1,
                    min: 0.0001,
                    max: 1.0,
                    automatable: false,
                    type: FLOAT
                }
            }
        },
        bits: {
            enumerable: true,
            get: function () {
                return this.processor.bits;
            },
            set: function (value) {
                this.processor.bits = value;
            }
        },
        normfreq: {
            enumerable: true,
            get: function () {
                return this.processor.normfreq;
            },
            set: function (value) {
                this.processor.normfreq = value;
            }
        }
    });
    Tuna.prototype.Cabinet = function (properties) {
        if(!properties) {
            properties = this.getDefaults();
        }
        this.input = userContext.createGain();
        this.activateNode = userContext.createGain();
        this.convolver = this.newConvolver(properties.impulsePath || "../impulses/impulse_guitar.wav");
        this.makeupNode = userContext.createGain();
        this.output = userContext.createGain();

        this.activateNode.connect(this.convolver.input);
        this.convolver.output.connect(this.makeupNode);
        this.makeupNode.connect(this.output);

        this.makeupGain = initValue(properties.makeupGain, this.defaults.makeupGain);
        this.bypass = properties.bypass || false;
    };
    Tuna.prototype.Cabinet.prototype = Object.create(Super, {
        name: {
            value: "Cabinet"
        },
        defaults: {
            writable:true,
            value: {
                makeupGain: {
                    value: 1,
                    min: 0,
                    max: 20,
                    automatable: true,
                    type: FLOAT
                },
                bypass: {
                    value: false,
                    automatable: false,
                    type: BOOLEAN
                }
            }
        },
        makeupGain: {
            enumerable: true,
            get: function () {
                return this.makeupNode.gain;
            },
            set: function (value) {
                this.makeupNode.gain.value = value;
            }
        },
        newConvolver: {
            value: function (impulsePath) {
                return new userInstance.Convolver({
                    impulse: impulsePath,
                    dryLevel: 0,
                    wetLevel: 1
                });
            }
        }
    });
    Tuna.prototype.Chorus = function (properties) {
        if(!properties) {
            properties = this.getDefaults();
        }
        this.input = userContext.createGain();
        this.attenuator = this.activateNode = userContext.createGain();
        this.splitter = userContext.createChannelSplitter(2);
        this.delayL = userContext.createDelay();
        this.delayR = userContext.createDelay();
        this.feedbackGainNodeLR = userContext.createGain();
        this.feedbackGainNodeRL = userContext.createGain();
        this.merger = userContext.createChannelMerger(2);
        this.output = userContext.createGain();

        this.lfoL = new userInstance.LFO({
            target: this.delayL.delayTime,
            callback: pipe
        });
        this.lfoR = new userInstance.LFO({
            target: this.delayR.delayTime,
            callback: pipe
        });

        this.input.connect(this.attenuator);
        this.attenuator.connect(this.output);
        this.attenuator.connect(this.splitter);
        this.splitter.connect(this.delayL, 0);
        this.splitter.connect(this.delayR, 1);
        this.delayL.connect(this.feedbackGainNodeLR);
        this.delayR.connect(this.feedbackGainNodeRL);
        this.feedbackGainNodeLR.connect(this.delayR);
        this.feedbackGainNodeRL.connect(this.delayL);
        this.delayL.connect(this.merger, 0, 0);
        this.delayR.connect(this.merger, 0, 1);
        this.merger.connect(this.output);

        this.feedback = initValue(properties.feedback, this.defaults.feedback.value);
        this.rate = initValue(properties.rate, this.defaults.rate.value);
        this.delay = initValue(properties.delay, this.defaults.delay.value);
        this.depth = initValue(properties.depth, this.defaults.depth.value);
        this.lfoR.phase = Math.PI / 2;
        this.attenuator.gain.value = 0.6934; // 1 / (10 ^ (((20 * log10(3)) / 3) / 20))
        this.lfoL.activate(true);
        this.lfoR.activate(true);
        this.bypass = properties.bypass || false;
    };
    Tuna.prototype.Chorus.prototype = Object.create(Super, {
        name: {
            value: "Chorus"
        },
        defaults: {
            writable:true,
            value: {
                feedback: {
                    value: 0.4,
                    min: 0,
                    max: 0.95,
                    automatable: false,
                    type: FLOAT
                },
                delay: {
                    value: 0.0045,
                    min: 0,
                    max: 1,
                    automatable: false,
                    type: FLOAT
                },
                depth: {
                    value: 0.7,
                    min: 0,
                    max: 1,
                    automatable: false,
                    type: FLOAT
                },
                rate: {
                    value: 1.5,
                    min: 0,
                    max: 8,
                    automatable: false,
                    type: FLOAT
                },
                bypass: {
                    value: true,
                    automatable: false,
                    type: BOOLEAN
                }
            }
        },
        delay: {
            enumerable: true,
            get: function () {
                return this._delay;
            },
            set: function (value) {
                this._delay = 0.0002 * (Math.pow(10, value) * 2);
                this.lfoL.offset = this._delay;
                this.lfoR.offset = this._delay;
                this._depth = this._depth;
            }
        },
        depth: {
            enumerable: true,
            get: function () {
                return this._depth;
            },
            set: function (value) {
                this._depth = value;
                this.lfoL.oscillation = this._depth * this._delay;
                this.lfoR.oscillation = this._depth * this._delay;
            }
        },
        feedback: {
            enumerable: true,
            get: function () {
                return this._feedback;
            },
            set: function (value) {
                this._feedback = value;
                this.feedbackGainNodeLR.gain.value = this._feedback;
                this.feedbackGainNodeRL.gain.value = this._feedback;
            }
        },
        rate: {
            enumerable: true,
            get: function () {
                return this._rate;
            },
            set: function (value) {
                this._rate = value;
                this.lfoL.frequency = this._rate;
                this.lfoR.frequency = this._rate;
            }
        }
    });
    Tuna.prototype.Compressor = function (properties) {
        if(!properties) {
            properties = this.getDefaults();
        }
        this.input = userContext.createGain();
        this.compNode = this.activateNode = userContext.createDynamicsCompressor();
        this.makeupNode = userContext.createGain();
        this.output = userContext.createGain();

        this.compNode.connect(this.makeupNode);
        this.makeupNode.connect(this.output);

        this.automakeup = initValue(properties.automakeup, this.defaults.automakeup.value);
        this.makeupGain = properties.makeupGain || this.defaults.makeupGain.value;
        this.threshold = initValue(properties.threshold, this.defaults.threshold.value);
        this.release = properties.release || this.defaults.release.value;
        this.attack = initValue(properties.attack, this.defaults.attack.value);
        this.ratio = properties.ratio || this.defaults.ratio.value;
        this.knee = initValue(properties.knee, this.defaults.knee.value);
        this.bypass = properties.bypass || false;
    };
    Tuna.prototype.Compressor.prototype = Object.create(Super, {
        name: {
            value: "Compressor"
        },
        defaults: {
            writable:true,
            value: {
                threshold: {
                    value: -20,
                    min: -60,
                    max: 0,
                    automatable: true,
                    type: FLOAT
                },
                release: {
                    value: 250,
                    min: 10,
                    max: 2000,
                    automatable: true,
                    type: FLOAT
                },
                makeupGain: {
                    value: 1,
                    min: 1,
                    max: 100,
                    automatable: true,
                    type: FLOAT
                },
                attack: {
                    value: 1,
                    min: 0,
                    max: 1000,
                    automatable: true,
                    type: FLOAT
                },
                ratio: {
                    value: 4,
                    min: 1,
                    max: 50,
                    automatable: true,
                    type: FLOAT
                },
                knee: {
                    value: 5,
                    min: 0,
                    max: 40,
                    automatable: true,
                    type: FLOAT
                },
                automakeup: {
                    value: false,
                    automatable: false,
                    type: BOOLEAN
                },
                bypass: {
                    value: true,
                    automatable: false,
                    type: BOOLEAN
                }
            }
        },
        computeMakeup: {
            value: function () {
                var magicCoefficient = 4,
                    // raise me if the output is too hot
                    c = this.compNode;
                return -(c.threshold.value - c.threshold.value / c.ratio.value) / magicCoefficient;
            }
        },
        automakeup: {
            enumerable: true,
            get: function () {
                return this._automakeup;
            },
            set: function (value) {
                this._automakeup = value;
                if(this._automakeup) this.makeupGain = this.computeMakeup();
            }
        },
        threshold: {
            enumerable: true,
            get: function () {
                return this.compNode.threshold;
            },
            set: function (value) {
                this.compNode.threshold.value = value;
                if(this._automakeup) this.makeupGain = this.computeMakeup();
            }
        },
        ratio: {
            enumerable: true,
            get: function () {
                return this.compNode.ratio;
            },
            set: function (value) {
                this.compNode.ratio.value = value;
                if(this._automakeup) this.makeupGain = this.computeMakeup();
            }
        },
        knee: {
            enumerable: true,
            get: function () {
                return this.compNode.knee;
            },
            set: function (value) {
                this.compNode.knee.value = value;
                if(this._automakeup) this.makeupGain = this.computeMakeup();
            }
        },
        attack: {
            enumerable: true,
            get: function () {
                return this.compNode.attack;
            },
            set: function (value) {
                this.compNode.attack.value = value / 1000;
            }
        },
        release: {
            enumerable: true,
            get: function () {
                return this.compNode.release;
            },
            set: function (value) {
                this.compNode.release = value / 1000;
            }
        },
        makeupGain: {
            enumerable: true,
            get: function () {
                return this.makeupNode.gain;
            },
            set: function (value) {
                this.makeupNode.gain.value = dbToWAVolume(value);
            }
        }
    });
    Tuna.prototype.Convolver = function (properties) {
        if(!properties) {
            properties = this.getDefaults();
        }
        this.input = userContext.createGain();
        this.activateNode = userContext.createGain();
        this.convolver = userContext.createConvolver();
        this.dry = userContext.createGain();
        this.filterLow = userContext.createBiquadFilter();
        this.filterHigh = userContext.createBiquadFilter();
        this.wet = userContext.createGain();
        this.output = userContext.createGain();

        this.activateNode.connect(this.filterLow);
        this.activateNode.connect(this.dry);
        this.filterLow.connect(this.filterHigh);
        this.filterHigh.connect(this.convolver);
        this.convolver.connect(this.wet);
        this.wet.connect(this.output);
        this.dry.connect(this.output);

        this.dryLevel = initValue(properties.dryLevel, this.defaults.dryLevel.value);
        this.wetLevel = initValue(properties.wetLevel, this.defaults.wetLevel.value);
        this.highCut = properties.highCut || this.defaults.highCut.value;
        this.buffer = properties.impulse || "../impulses/ir_rev_short.wav";
        this.lowCut = properties.lowCut || this.defaults.lowCut.value;
        this.level = initValue(properties.level, this.defaults.level.value);
        this.filterHigh.type = "lowpass";
        this.filterLow.type = "highpass";
        this.bypass = properties.bypass || false;
    };
    Tuna.prototype.Convolver.prototype = Object.create(Super, {
        name: {
            value: "Convolver"
        },
        defaults: {
            writable:true,
            value: {
                highCut: {
                    value: 22050,
                    min: 20,
                    max: 22050,
                    automatable: true,
                    type: FLOAT
                },
                lowCut: {
                    value: 20,
                    min: 20,
                    max: 22050,
                    automatable: true,
                    type: FLOAT
                },
                dryLevel: {
                    value: 1,
                    min: 0,
                    max: 1,
                    automatable: true,
                    type: FLOAT
                },
                wetLevel: {
                    value: 1,
                    min: 0,
                    max: 1,
                    automatable: true,
                    type: FLOAT
                },
                level: {
                    value: 1,
                    min: 0,
                    max: 1,
                    automatable: true,
                    type: FLOAT
                }
            }
        },
        lowCut: {
            get: function () {
                return this.filterLow.frequency;
            },
            set: function (value) {
                this.filterLow.frequency.value = value;
            }
        },
        highCut: {
            get: function () {
                return this.filterHigh.frequency;
            },
            set: function (value) {
                this.filterHigh.frequency.value = value;
            }
        },
        level: {
            get: function () {
                return this.output.gain;
            },
            set: function (value) {
                this.output.gain.value = value;
            }
        },
        dryLevel: {
            get: function () {
                return this.dry.gain
            },
            set: function (value) {
                this.dry.gain.value = value;
            }
        },
        wetLevel: {
            get: function () {
                return this.wet.gain;
            },
            set: function (value) {
                this.wet.gain.value = value;
            }
        },
        buffer: {
            enumerable: false,
            get: function () {
                return this.convolver.buffer;
            },
            set: function (impulse) {
                var convolver = this.convolver,
                    xhr = new XMLHttpRequest();
                if(!impulse) {
                    console.log("Tuna.Convolver.setBuffer: Missing impulse path!");
                    return;
                }
                xhr.open("GET", impulse, true);
                xhr.responseType = "arraybuffer";
                xhr.onreadystatechange = function () {
                    if(xhr.readyState === 4) {
                        if(xhr.status < 300 && xhr.status > 199 || xhr.status === 302) {
                            userContext.decodeAudioData(xhr.response, function (buffer) {
                                convolver.buffer = buffer;
                            }, function (e) {
                                if(e) console.log("Tuna.Convolver.setBuffer: Error decoding data" + e);
                            });
                        }
                    }
                };
                xhr.send(null);
            }
        }
    });
    Tuna.prototype.Delay = function (properties) {
        if(!properties) {
            properties = this.getDefaults();
        }
        this.input = userContext.createGain();
        this.activateNode = userContext.createGain();
        this.dry = userContext.createGain();
        this.wet = userContext.createGain();
        this.filter = userContext.createBiquadFilter();
        this.delay = userContext.createDelay();
        this.feedbackNode = userContext.createGain();
        this.output = userContext.createGain();

        this.activateNode.connect(this.delay);
        this.activateNode.connect(this.dry);
        this.delay.connect(this.filter);
        this.filter.connect(this.feedbackNode);
        this.feedbackNode.connect(this.delay);
        this.feedbackNode.connect(this.wet);
        this.wet.connect(this.output);
        this.dry.connect(this.output);

        this.delayTime = properties.delayTime || this.defaults.delayTime.value;
        this.feedback = initValue(properties.feedback, this.defaults.feedback.value);
        this.wetLevel = initValue(properties.wetLevel, this.defaults.wetLevel.value);
        this.dryLevel = initValue(properties.dryLevel, this.defaults.dryLevel.value);
        this.cutoff = properties.cutoff || this.defaults.cutoff.value;
        this.filter.type = "lowpass";
        this.bypass = properties.bypass || false;
    };
    Tuna.prototype.Delay.prototype = Object.create(Super, {
        name: {
            value: "Delay"
        },
        defaults: {
            writable:true,
            value: {
                delayTime: {
                    value: 100,
                    min: 20,
                    max: 1000,
                    automatable: false,
                    type: FLOAT
                },
                feedback: {
                    value: 0.45,
                    min: 0,
                    max: 0.9,
                    automatable: true,
                    type: FLOAT
                },
                cutoff: {
                    value: 20000,
                    min: 20,
                    max: 20000,
                    automatable: true,
                    type: FLOAT
                },
                wetLevel: {
                    value: 0.5,
                    min: 0,
                    max: 1,
                    automatable: true,
                    type: FLOAT
                },
                dryLevel: {
                    value: 1,
                    min: 0,
                    max: 1,
                    automatable: true,
                    type: FLOAT
                }
            }
        },
        delayTime: {
            enumerable: true,
            get: function () {
                return this.delay.delayTime;
            },
            set: function (value) {
                this.delay.delayTime.value = value / 1000;
            }
        },
        wetLevel: {
            enumerable: true,
            get: function () {
                return this.wet.gain;
            },
            set: function (value) {
                this.wet.gain.value = value;
            }
        },
        dryLevel: {
            enumerable: true,
            get: function () {
                return this.dry.gain;
            },
            set: function (value) {
                this.dry.gain.value = value;
            }
        },
        feedback: {
            enumerable: true,
            get: function () {
                return this.feedbackNode.gain;
            },
            set: function (value) {
                this.feedbackNode.gain.value = value;
            }
        },
        cutoff: {
            enumerable: true,
            get: function () {
                return this.filter.frequency;
            },
            set: function (value) {
                this.filter.frequency.value = value;
            }
        }
    });
    Tuna.prototype.MoogFilter = function (properties) {
        if(!properties) {
            properties = this.getDefaults();
        }
        this.bufferSize = properties.bufferSize || this.defaults.bufferSize.value;

        this.input = userContext.createGain();
        this.activateNode = userContext.createGain();
        this.processor = userContext.createScriptProcessor(this.bufferSize, 1, 1);
        this.output = userContext.createGain();

        this.activateNode.connect(this.processor);
        this.processor.connect(this.output);

        var in1, in2, in3, in4, out1, out2, out3, out4;
        in1 = in2 = in3 = in4 = out1 = out2 = out3 = out4 = 0.0;
        var input, output, f, fb, i, length;
        this.processor.onaudioprocess = function (e) {
            input = e.inputBuffer.getChannelData(0),
            output = e.outputBuffer.getChannelData(0),
            f = this.cutoff * 1.16,
            inputFactor = 0.35013 * (f*f)*(f*f);
            fb = this.resonance * (1.0 - 0.15 * f * f);
            length = input.length;
            for(i = 0; i < length; i++) {
                input[i] -= out4 * fb;
                input[i] *= inputFactor;
                out1 = input[i] + 0.3 * in1 + (1 - f) * out1; // Pole 1
                in1 = input[i];
                out2 = out1 + 0.3 * in2 + (1 - f) * out2; // Pole 2
                in2 = out1;
                out3 = out2 + 0.3 * in3 + (1 - f) * out3; // Pole 3
                in3 = out2;
                out4 = out3 + 0.3 * in4 + (1 - f) * out4; // Pole 4
                in4 = out3;
                output[i] = out4;
            }
        };

        this.cutoff = initValue(properties.cutoff, this.defaults.cutoff.value);
        this.resonance = initValue(properties.resonance, this.defaults.resonance.value);
        this.bypass = properties.bypass || false;
    };
    Tuna.prototype.MoogFilter.prototype = Object.create(Super, {
        name: {
            value: "MoogFilter"
        },
        defaults: {
            writable: true,
            value: {
                bufferSize: {
                    value: 4096,
                    min: 256,
                    max: 16384,
                    automatable: false,
                    type: INT
                },
                bypass: {
                    value: false,
                    automatable: false,
                    type: BOOLEAN
                },
                cutoff: {
                    value: 0.065,
                    min: 0.0001,
                    max: 1.0,
                    automatable: false,
                    type: FLOAT
                },
                resonance: {
                    value: 3.5,
                    min: 0.0,
                    max: 4.0,
                    automatable: false,
                    type: FLOAT
                }
            }
        },
        cutoff: {
            enumerable: true,
            get: function () {
                return this.processor.cutoff;
            },
            set: function (value) {
                this.processor.cutoff = value;
            }
        },
        resonance: {
            enumerable: true,
            get: function () {
                return this.processor.resonance;
            },
            set: function (value) {
                this.processor.resonance = value;
            }
        }
    });
    Tuna.prototype.Overdrive = function (properties) {
        if(!properties) {
            properties = this.getDefaults();
        }
        this.input = userContext.createGain();
        this.activateNode = userContext.createGain();
        this.inputDrive = userContext.createGain();
        this.waveshaper = userContext.createWaveShaper();
        this.outputDrive = userContext.createGain();
        this.output = userContext.createGain();

        this.activateNode.connect(this.inputDrive);
        this.inputDrive.connect(this.waveshaper);
        this.waveshaper.connect(this.outputDrive);
        this.outputDrive.connect(this.output);

        this.ws_table = new Float32Array(this.k_nSamples);
        this.drive = initValue(properties.drive, this.defaults.drive.value);
        this.outputGain = initValue(properties.outputGain, this.defaults.outputGain.value);
        this.curveAmount = initValue(properties.curveAmount, this.defaults.curveAmount.value);
        this.algorithmIndex = initValue(properties.algorithmIndex, this.defaults.algorithmIndex.value);
        this.bypass = properties.bypass || false;
    };
    Tuna.prototype.Overdrive.prototype = Object.create(Super, {
        name: {
            value: "Overdrive"
        },
        defaults: {
            writable:true,
            value: {
                drive: {
                    value: 1,
                    min: 0,
                    max: 1,
                    automatable: true,
                    type: FLOAT,
                    scaled: true
                },
                outputGain: {
                    value: 1,
                    min: 0,
                    max: 1,
                    automatable: true,
                    type: FLOAT,
                    scaled: true
                },
                curveAmount: {
                    value: 0.725,
                    min: 0,
                    max: 1,
                    automatable: false,
                    type: FLOAT
                },
                algorithmIndex: {
                    value: 0,
                    min: 0,
                    max: 5,
                    automatable: false,
                    type: INT
                }
            }
        },
        k_nSamples: {
            value: 8192
        },
        drive: {
            get: function () {
                return this.inputDrive.gain;
            },
            set: function (value) {
                this._drive = value;
            }
        },
        curveAmount: {
            get: function () {
                return this._curveAmount;
            },
            set: function (value) {
                this._curveAmount = value;
                if(this._algorithmIndex === undefined) {
                    this._algorithmIndex = 0;
                }
                this.waveshaperAlgorithms[this._algorithmIndex](this._curveAmount, this.k_nSamples, this.ws_table);
                this.waveshaper.curve = this.ws_table;
            }
        },
        outputGain: {
            get: function () {
                return this.outputDrive.gain;
            },
            set: function (value) {
                this._outputGain = dbToWAVolume(value);
            }
        },
        algorithmIndex: {
            get: function () {
                return this._algorithmIndex;
            },
            set: function (value) {
                this._algorithmIndex = value;
                this.curveAmount = this._curveAmount;
            }
        },
        waveshaperAlgorithms: {
            value: [

            function (amount, n_samples, ws_table) {
                amount = Math.min(amount, 0.9999);
                var k = 2 * amount / (1 - amount),
                    i, x;
                for(i = 0; i < n_samples; i++) {
                    x = i * 2 / n_samples - 1;
                    ws_table[i] = (1 + k) * x / (1 + k * Math.abs(x));
                }
            }, function (amount, n_samples, ws_table) {
                var i, x, y;
                for(i = 0; i < n_samples; i++) {
                    x = i * 2 / n_samples - 1;
                    y = ((0.5 * Math.pow((x + 1.4), 2)) - 1) * y >= 0 ? 5.8 : 1.2;
                    ws_table[i] = tanh(y);
                }
            }, function (amount, n_samples, ws_table) {
                var i, x, y, a = 1 - amount;
                for(i = 0; i < n_samples; i++) {
                    x = i * 2 / n_samples - 1;
                    y = x < 0 ? -Math.pow(Math.abs(x), a + 0.04) : Math.pow(x, a);
                    ws_table[i] = tanh(y * 2);
                }
            }, function (amount, n_samples, ws_table) {
                var i, x, y, abx, a = 1 - amount > 0.99 ? 0.99 : 1 - amount;
                for(i = 0; i < n_samples; i++) {
                    x = i * 2 / n_samples - 1;
                    abx = Math.abs(x);
                    if(abx < a) y = abx;
                    else if(abx > a) y = a + (abx - a) / (1 + Math.pow((abx - a) / (1 - a), 2));
                    else if(abx > 1) y = abx;
                    ws_table[i] = sign(x) * y * (1 / ((a + 1) / 2));
                }
            }, function (amount, n_samples, ws_table) { // fixed curve, amount doesn't do anything, the distortion is just from the drive
                var i, x;
                for(i = 0; i < n_samples; i++) {
                    x = i * 2 / n_samples - 1;
                    if(x < -0.08905) {
                        ws_table[i] = (-3 / 4) * (1 - (Math.pow((1 - (Math.abs(x) - 0.032857)), 12)) + (1 / 3) * (Math.abs(x) - 0.032847)) + 0.01;
                    } else if(x >= -0.08905 && x < 0.320018) {
                        ws_table[i] = (-6.153 * (x * x)) + 3.9375 * x;
                    } else {
                        ws_table[i] = 0.630035;
                    }
                }
            }, function (amount, n_samples, ws_table) {
                var a = 2 + Math.round(amount * 14),
                    // we go from 2 to 16 bits, keep in mind for the UI
                    bits = Math.round(Math.pow(2, a - 1)),
                    // real number of quantization steps divided by 2
                    i, x;
                for(i = 0; i < n_samples; i++) {
                    x = i * 2 / n_samples - 1;
                    ws_table[i] = Math.round(x * bits) / bits;
                }
            }]
        }
    });
    Tuna.prototype.Phaser = function (properties) {
        if(!properties) {
            properties = this.getDefaults();
        }
        this.input = userContext.createGain();
        this.splitter = this.activateNode = userContext.createChannelSplitter(2);
        this.filtersL = [];
        this.filtersR = [];
        this.feedbackGainNodeL = userContext.createGain();
        this.feedbackGainNodeR = userContext.createGain();
        this.merger = userContext.createChannelMerger(2);
        this.filteredSignal = userContext.createGain();
        this.output = userContext.createGain();
        this.lfoL = new userInstance.LFO({
            target: this.filtersL,
            callback: this.callback
        });
        this.lfoR = new userInstance.LFO({
            target: this.filtersR,
            callback: this.callback
        });

        var i = this.stage;
        while(i--) {
            this.filtersL[i] = userContext.createBiquadFilter();
            this.filtersR[i] = userContext.createBiquadFilter();
            this.filtersL[i].type = "allpass";
            this.filtersR[i].type = "allpass";
        }
        this.input.connect(this.splitter);
        this.input.connect(this.output);
        this.splitter.connect(this.filtersL[0], 0, 0);
        this.splitter.connect(this.filtersR[0], 1, 0);
        this.connectInOrder(this.filtersL);
        this.connectInOrder(this.filtersR);
        this.filtersL[this.stage - 1].connect(this.feedbackGainNodeL);
        this.filtersL[this.stage - 1].connect(this.merger, 0, 0);
        this.filtersR[this.stage - 1].connect(this.feedbackGainNodeR);
        this.filtersR[this.stage - 1].connect(this.merger, 0, 1);
        this.feedbackGainNodeL.connect(this.filtersL[0]);
        this.feedbackGainNodeR.connect(this.filtersR[0]);
        this.merger.connect(this.output);

        this.rate = initValue(properties.rate, this.defaults.rate.value);
        this.baseModulationFrequency = properties.baseModulationFrequency || this.defaults.baseModulationFrequency.value;
        this.depth = initValue(properties.depth, this.defaults.depth.value);
        this.feedback = initValue(properties.feedback, this.defaults.feedback.value);
        this.stereoPhase = initValue(properties.stereoPhase, this.defaults.stereoPhase.value);

        this.lfoL.activate(true);
        this.lfoR.activate(true);
        this.bypass = properties.bypass || false;
    };
    Tuna.prototype.Phaser.prototype = Object.create(Super, {
        name: {
            value: "Phaser"
        },
        stage: {
            value: 4
        },
        defaults: {
            writable:true,
            value: {
                rate: {
                    value: 0.1,
                    min: 0,
                    max: 8,
                    automatable: false,
                    type: FLOAT
                },
                depth: {
                    value: 0.6,
                    min: 0,
                    max: 1,
                    automatable: false,
                    type: FLOAT
                },
                feedback: {
                    value: 0.7,
                    min: 0,
                    max: 1,
                    automatable: false,
                    type: FLOAT
                },
                stereoPhase: {
                    value: 40,
                    min: 0,
                    max: 180,
                    automatable: false,
                    type: FLOAT
                },
                baseModulationFrequency: {
                    value: 700,
                    min: 500,
                    max: 1500,
                    automatable: false,
                    type: FLOAT
                }
            }
        },
        callback: {
            value: function (filters, value) {
                for(var stage = 0; stage < 4; stage++) {
                    filters[stage].frequency.value = value;
                }
            }
        },
        depth: {
            get: function () {
                return this._depth;
            },
            set: function (value) {
                this._depth = value;
                this.lfoL.oscillation = this._baseModulationFrequency * this._depth;
                this.lfoR.oscillation = this._baseModulationFrequency * this._depth;
            }
        },
        rate: {
            get: function () {
                return this._rate;
            },
            set: function (value) {
                this._rate = value;
                this.lfoL.frequency = this._rate;
                this.lfoR.frequency = this._rate;
            }
        },
        baseModulationFrequency: {
            enumerable: true,
            get: function () {
                return this._baseModulationFrequency;
            },
            set: function (value) {
                this._baseModulationFrequency = value;
                this.lfoL.offset = this._baseModulationFrequency;
                this.lfoR.offset = this._baseModulationFrequency;
                this._depth = this._depth;
            }
        },
        feedback: {
            get: function () {
                return this._feedback;
            },
            set: function (value) {
                this._feedback = value;
                this.feedbackGainNodeL.gain.value = this._feedback;
                this.feedbackGainNodeR.gain.value = this._feedback;
            }
        },
        stereoPhase: {
            get: function () {
                return this._stereoPhase;
            },
            set: function (value) {
                this._stereoPhase = value;
                var newPhase = this.lfoL._phase + this._stereoPhase * Math.PI / 180;
                newPhase = fmod(newPhase, 2 * Math.PI);
                this.lfoR._phase = newPhase;
            }
        }
    });
    Tuna.prototype.Tremolo = function (properties) {
        if(!properties) {
            properties = this.getDefaults();
        }
        this.input = userContext.createGain();
        this.splitter = this.activateNode = userContext.createChannelSplitter(2), this.amplitudeL = userContext.createGain(), this.amplitudeR = userContext.createGain(), this.merger = userContext.createChannelMerger(2), this.output = userContext.createGain();
        this.lfoL = new userInstance.LFO({
            target: this.amplitudeL.gain,
            callback: pipe
        });
        this.lfoR = new userInstance.LFO({
            target: this.amplitudeR.gain,
            callback: pipe
        });

        this.input.connect(this.splitter);
        this.splitter.connect(this.amplitudeL, 0);
        this.splitter.connect(this.amplitudeR, 1);
        this.amplitudeL.connect(this.merger, 0, 0);
        this.amplitudeR.connect(this.merger, 0, 1);
        this.merger.connect(this.output);

        this.rate = properties.rate || this.defaults.rate.value;
        this.intensity = initValue(properties.intensity, this.defaults.intensity.value);
        this.stereoPhase = initValue(properties.stereoPhase, this.defaults.stereoPhase.value);

        this.lfoL.offset = 1 - (this.intensity / 2);
        this.lfoR.offset = 1 - (this.intensity / 2);
        this.lfoL.phase = this.stereoPhase * Math.PI / 180;

        this.lfoL.activate(true);
        this.lfoR.activate(true);
        this.bypass = properties.bypass || false;
    };
    Tuna.prototype.Tremolo.prototype = Object.create(Super, {
        name: {
            value: "Tremolo"
        },
        defaults: {
            writable:true,
            value: {
                intensity: {
                    value: 0.3,
                    min: 0,
                    max: 1,
                    automatable: false,
                    type: FLOAT
                },
                stereoPhase: {
                    value: 0,
                    min: 0,
                    max: 180,
                    automatable: false,
                    type: FLOAT
                },
                rate: {
                    value: 5,
                    min: 0.1,
                    max: 11,
                    automatable: false,
                    type: FLOAT
                }
            }
        },
        intensity: {
            enumerable: true,
            get: function () {
                return this._intensity;
            },
            set: function (value) {
                this._intensity = value;
                this.lfoL.offset = 1 - this._intensity / 2;
                this.lfoR.offset = 1 - this._intensity / 2;
                this.lfoL.oscillation = this._intensity;
                this.lfoR.oscillation = this._intensity;
            }
        },
        rate: {
            enumerable: true,
            get: function () {
                return this._rate;
            },
            set: function (value) {
                this._rate = value;
                this.lfoL.frequency = this._rate;
                this.lfoR.frequency = this._rate;
            }
        },
        stereoPhase: {
            enumerable: true,
            get: function () {
                return this._rate;
            },
            set: function (value) {
                this._stereoPhase = value;
                var newPhase = this.lfoL._phase + this._stereoPhase * Math.PI / 180;
                newPhase = fmod(newPhase, 2 * Math.PI);
                this.lfoR.phase = newPhase;
            }
        }
    });
    Tuna.prototype.WahWah = function (properties) {
        if(!properties) {
            properties = this.getDefaults();
        }
        this.input = userContext.createGain();
        this.activateNode = userContext.createGain();
        this.envelopeFollower = new userInstance.EnvelopeFollower({
            target: this,
            callback: function (context, value) {
                context.sweep = value;
            }
        });
        this.filterBp = userContext.createBiquadFilter();
        this.filterPeaking = userContext.createBiquadFilter();
        this.output = userContext.createGain();

        //Connect AudioNodes
        this.activateNode.connect(this.filterBp);
        this.filterBp.connect(this.filterPeaking);
        this.filterPeaking.connect(this.output);

        //Set Properties
        this.init();
        this.automode = initValue(properties.enableAutoMode, this.defaults.automode.value);
        this.resonance = properties.resonance || this.defaults.resonance.value;
        this.sensitivity = initValue(properties.sensitivity, this.defaults.sensitivity.value);
        this.baseFrequency = initValue(properties.baseFrequency, this.defaults.baseFrequency.value);
        this.excursionOctaves = properties.excursionOctaves || this.defaults.excursionOctaves.value;
        this.sweep = initValue(properties.sweep, this.defaults.sweep.value);

        this.activateNode.gain.value = 2;
        this.envelopeFollower.activate(true);
        this.bypass = properties.bypass || false;
    };
    Tuna.prototype.WahWah.prototype = Object.create(Super, {
        name: {
            value: "WahWah"
        },
        defaults: {
            writable:true,
            value: {
                automode: {
                    value: true,
                    automatable: false,
                    type: BOOLEAN
                },
                baseFrequency: {
                    value: 0.5,
                    min: 0,
                    max: 1,
                    automatable: false,
                    type: FLOAT
                },
                excursionOctaves: {
                    value: 2,
                    min: 1,
                    max: 6,
                    automatable: false,
                    type: FLOAT
                },
                sweep: {
                    value: 0.2,
                    min: 0,
                    max: 1,
                    automatable: false,
                    type: FLOAT
                },
                resonance: {
                    value: 10,
                    min: 1,
                    max: 100,
                    automatable: false,
                    type: FLOAT
                },
                sensitivity: {
                    value: 0.5,
                    min: -1,
                    max: 1,
                    automatable: false,
                    type: FLOAT
                }
            }
        },
        activateCallback: {
            value: function (value) {
                this.automode = value;
            }
        },
        automode: {
            get: function () {
                return this._automode;
            },
            set: function (value) {
                this._automode = value;
                if(value) {
                    this.activateNode.connect(this.envelopeFollower.input);
                    this.envelopeFollower.activate(true);
                } else {
                    this.envelopeFollower.activate(false);
                    this.activateNode.disconnect();
                    this.activateNode.connect(this.filterBp);
                }
            }
        },
        filterFreqTimeout: {
            value: 0
        },
        setFilterFreq: {
            value: function() {
                try{
                    this.filterBp.frequency.value = this._baseFrequency + this._excursionFrequency * this._sweep;
                    this.filterPeaking.frequency.value = this._baseFrequency + this._excursionFrequency * this._sweep;
                } catch(e) {
                    clearTimeout(this.filterFreqTimeout);
                    //put on the next cycle to let all init properties be set
                    this.filterFreqTimeout = setTimeout(function() {
                        this.setFilterFreq();
                    }.bind(this), 0);
                }
            }
        },
        sweep: {
            enumerable: true,
            get: function () {
                return this._sweep.value;
            },
            set: function (value) {
                this._sweep = Math.pow(value > 1 ? 1 : value < 0 ? 0 : value, this._sensitivity);
                this.setFilterFreq();
            }
        },
        baseFrequency: {
            enumerable: true,
            get: function () {
                return this._baseFrequency;
            },
            set: function (value) {
                this._baseFrequency = 50 * Math.pow(10, value * 2);
                this._excursionFrequency = Math.min(userContext.sampleRate / 2, this.baseFrequency * Math.pow(2, this._excursionOctaves));
                this.setFilterFreq();
            }
        },
        excursionOctaves: {
            enumerable: true,
            get: function () {
                return this._excursionOctaves;
            },
            set: function (value) {
                this._excursionOctaves = value;
                this._excursionFrequency = Math.min(userContext.sampleRate / 2, this.baseFrequency * Math.pow(2, this._excursionOctaves));
                this.setFilterFreq();
            }
        },
        sensitivity: {
            enumerable: true,
            get: function () {
                return this._sensitivity;
            },
            set: function (value) {
                this._sensitivity = Math.pow(10, value);
            }
        },
        resonance: {
            enumerable: true,
            get: function () {
                return this._resonance;
            },
            set: function (value) {
                this._resonance = value;
                this.filterPeaking.Q = this._resonance;
            }
        },
        init: {
            value: function () {
                this.output.gain.value = 1;
                this.filterPeaking.type = "peaking";
                this.filterBp.type = "bandpass";
                this.filterPeaking.frequency.value = 100;
                this.filterPeaking.gain.value = 20;
                this.filterPeaking.Q.value = 5;
                this.filterBp.frequency.value = 100;
                this.filterBp.Q.value = 1;
            }
        }
    });
    Tuna.prototype.EnvelopeFollower = function (properties) {
        if(!properties) {
            properties = this.getDefaults();
        }
        this.input = userContext.createGain();
        this.jsNode = this.output = userContext.createScriptProcessor(this.buffersize, 1, 1);

        this.input.connect(this.output);

        this.attackTime = initValue(properties.attackTime, this.defaults.attackTime.value);
        this.releaseTime = initValue(properties.releaseTime, this.defaults.releaseTime.value);
        this._envelope = 0;
        this.target = properties.target || {};
        this.callback = properties.callback || function () {};
    };
    Tuna.prototype.EnvelopeFollower.prototype = Object.create(Super, {
        name: {
            value: "EnvelopeFollower"
        },
        defaults: {
            value: {
                attackTime: {
                    value: 0.003,
                    min: 0,
                    max: 0.5,
                    automatable: false,
                    type: FLOAT
                },
                releaseTime: {
                    value: 0.5,
                    min: 0,
                    max: 0.5,
                    automatable: false,
                    type: FLOAT
                }
            }
        },
        buffersize: {
            value: 256
        },
        envelope: {
            value: 0
        },
        sampleRate: {
            value: 44100
        },
        attackTime: {
            enumerable: true,
            get: function () {
                return this._attackTime;
            },
            set: function (value) {
                this._attackTime = value;
                this._attackC = Math.exp(-1 / this._attackTime * this.sampleRate / this.buffersize);
            }
        },
        releaseTime: {
            enumerable: true,
            get: function () {
                return this._releaseTime;
            },
            set: function (value) {
                this._releaseTime = value;
                this._releaseC = Math.exp(-1 / this._releaseTime * this.sampleRate / this.buffersize);
            }
        },
        callback: {
            get: function () {
                return this._callback;
            },
            set: function (value) {
                if(typeof value === "function") {
                    this._callback = value;
                } else {
                    console.error("tuna.js: " + this.name + ": Callback must be a function!");
                }
            }
        },
        target: {
            get: function () {
                return this._target;
            },
            set: function (value) {
                this._target = value;
            }
        },
        activate: {
            value: function (doActivate) {
                this.activated = doActivate;
                if(doActivate) {
                    this.jsNode.connect(userContext.destination);
                    this.jsNode.onaudioprocess = this.returnCompute(this);
                } else {
                    this.jsNode.disconnect();
                    this.jsNode.onaudioprocess = null;
                }
            }
        },
        returnCompute: {
            value: function (instance) {
                return function (event) {
                    instance.compute(event);
                };
            }
        },
        compute: {
            value: function (event) {
                var count = event.inputBuffer.getChannelData(0).length,
                    channels = event.inputBuffer.numberOfChannels,
                    current, chan, rms, i;
                chan = rms = i = 0;
                if(channels > 1) { //need to mixdown
                    for(i = 0; i < count; ++i) {
                        for(; chan < channels; ++chan) {
                            current = event.inputBuffer.getChannelData(chan)[i];
                            rms += (current * current) / channels;
                        }
                    }
                } else {
                    for(i = 0; i < count; ++i) {
                        current = event.inputBuffer.getChannelData(0)[i];
                        rms += (current * current);
                    }
                }
                rms = Math.sqrt(rms);

                if(this._envelope < rms) {
                    this._envelope *= this._attackC;
                    this._envelope += (1 - this._attackC) * rms;
                } else {
                    this._envelope *= this._releaseC;
                    this._envelope += (1 - this._releaseC) * rms;
                }
                this._callback(this._target, this._envelope);
            }
        }
    });
    Tuna.prototype.LFO = function (properties) {
        //Instantiate AudioNode
        this.output = userContext.createScriptProcessor(256, 1, 1);
        this.activateNode = userContext.destination;

        //Set Properties
        this.frequency = initValue(properties.frequency, this.defaults.frequency.value);
        this.offset = initValue(properties.offset, this.defaults.offset.value);
        this.oscillation = initValue(properties.oscillation, this.defaults.oscillation.value);
        this.phase = initValue(properties.phase, this.defaults.phase.value);
        this.target = properties.target || {};
        this.output.onaudioprocess = this.callback(properties.callback ||
        function () {});
        this.bypass = properties.bypass || false;
    };
    Tuna.prototype.LFO.prototype = Object.create(Super, {
        name: {
            value: "LFO"
        },
        bufferSize: {
            value: 256
        },
        sampleRate: {
            value: 44100
        },
        defaults: {
            value: {
                frequency: {
                    value: 1,
                    min: 0,
                    max: 20,
                    automatable: false,
                    type: FLOAT
                },
                offset: {
                    value: 0.85,
                    min: 0,
                    max: 22049,
                    automatable: false,
                    type: FLOAT
                },
                oscillation: {
                    value: 0.3,
                    min: -22050,
                    max: 22050,
                    automatable: false,
                    type: FLOAT
                },
                phase: {
                    value: 0,
                    min: 0,
                    max: 2 * Math.PI,
                    automatable: false,
                    type: FLOAT
                }
            }
        },
        frequency: {
            get: function () {
                return this._frequency;
            },
            set: function (value) {
                this._frequency = value;
                this._phaseInc = 2 * Math.PI * this._frequency * this.bufferSize / this.sampleRate;
            }
        },
        offset: {
            get: function () {
                return this._offset;
            },
            set: function (value) {
                this._offset = value;
            }
        },
        oscillation: {
            get: function () {
                return this._oscillation;
            },
            set: function (value) {
                this._oscillation = value;
            }
        },
        phase: {
            get: function () {
                return this._phase;
            },
            set: function (value) {
                this._phase = value;
            }
        },
        target: {
            get: function () {
                return this._target;
            },
            set: function (value) {
                this._target = value;
            }
        },
        activate: {
            value: function (doActivate) {
                if(!doActivate) {
                    this.output.disconnect(userContext.destination);
                } else {
                    this.output.connect(userContext.destination);
                }
            }
        },
        callback: {
            value: function (callback) {
                var that = this;
                return function () {
                    that._phase += that._phaseInc;
                    if(that._phase > 2 * Math.PI) {
                        that._phase = 0;
                    }
                    callback(that._target, that._offset + that._oscillation * Math.sin(that._phase));
                };
            }
        }
    });
    Tuna.toString = Tuna.prototype.toString = function () {
        return "You are running Tuna version " + version + " by Dinahmoe!";
    };
    if(typeof define === "function") {
        define("Tuna", [], function () {
            return Tuna;
        });
    } else {
        window.Tuna = Tuna;
    }
})(this);