Add independent Formant-Shifting to Pitchshift Effect.

[Swiftb0y]

Feature Description

Rubberband engines (V3/OptionEngineFiner and RubberBandLiveShifter) have a setFormantScale option which allows for some nice effects without independent of the pitch shifting. It would be nice to have that parameter exposed as another Knob. We currently use 2 of three 3 available knobs for the PitchShiftEffect, this would be a good third candidate. We may need to find another name though that reflects both features better.

Unless we switch to the V3 engine for the Pitchshift effect, #13973 is a prerequisite for this.

CC @davidchocholaty.

[davidchocholaty]

Thank you for the research. Sounds good to me. Keep this in mind when creating the solution for #13973. I agree with adding another knob for this "effect." For clarification, do you think finding another name for the effect itself (so replace the "PitchShiftEffect" name)?

[Swiftb0y]

I'm not sure. Changing it would make sense because the name no longer accurately reflects the entire feature set, but I don't want to debate what name is best. I think similar audio plugins used in music production are usually referred to as generic "Frequency shifter"s. So I guess we can call it "Frequency Shift Effect" since pitch and formant shifting are both different ways of doing that.

[davidchocholaty]

That sounds reasonable. I like it!