VMPK
Excerpt from VMPK website VMPK Virtual MIDI Piano Keyboard is a MIDI events generator and receiver. It doesn't produce any sound by itself, but can be used to drive a MIDI synthesizer (either hardware or software, internal or external). You can use the computer's keyboard to play MIDI notes, and also the mouse. You can use the Virtual MIDI Piano Keyboard to display the played MIDI notes from another instrument or MIDI file player. To do so, connect the other MIDI port to the input port of VMPK.
In VMPK you can use a custom instruments file. Below are the contents of my personal custom.ins that I use to test USBSID-Pico with VMPK.
You can load this file on the Behaviour tab in the Edit -> Preferences menu.
Be sure to copy the contents below into a new file and save it as somename.ins.
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.Patch Names
[1VoiceSID]
0=01 SID 1 Noise
1=02 SID 1 Pulse
2=03 SID 1 Sawtooth
3=04 SID 1 Triangle
[3VoiceSID]
0=01 SID 1 Noise
1=02 SID 1 Pulse
2=03 SID 1 Sawtooth
3=04 SID 1 Triangle
[Synthcart]
0=01 SAWTOOTH BASS
1=02 GRITTY BASS
2=03 PORTAMENTO 5THS
3=04 SAW PORTAMENTO
4=05 PULSE 5THS
5=06 PULSE HIGH PORT
6=07 TRINGL HIGH LONG
7=08 TRIANGLE DROP
8=09 SID EXPLOSION
9=10 MUTE
10=11 FILTER BASS
11=12 SWEEP ARP
12=13 PLUCK ARP
13=14 SLOW ARP
14=15 FILTER STACK 1
15=16 FILTER STACK 2
16=17 PULSAR
17=18 VIBRATO LEAD
18=19 SLOW RISE
19=20 BENDING ECHO
20=21 CHANNEL SAW
21=22 ARP LEAD
22=23 LASER BASS
23=24 TROMBONE BLAST
24=25 NOISY SQUARE ARP
25=26 TRIANGLE SYNC
26=27 MONO SYNC ECHO
27=28 CLEAN SAWTOOTH
28=29 CLEAN TRIANGLE
29=30 CLEAN SQUARE
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.Note Names
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.Controller Names
[MOS SID Controllers]
1=Pulse Width
7=Master Volume
20=Note Frequency
21=Noise waveform
22=Pulse waveform
23=Sawtooth waveform
24=Triangle waveform
25=Test bit
26=Ring modulator bit
27=Sync bit
28=Gate bit
29=Gate auto enable bit
110=Frequency Cutoff
111=Filter resonance
112=Voice 3 disconnect
113=Filter channel 1
114=Filter channel 2
115=Filter channel 3
116=Filter external
117=High pass
118=Band pass
119=Low pass
73=Attack Time
75=Decay
64=Sustain
72=Release Time
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.RPN Names
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.NRPN Names
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.Instrument Definitions
[MOS SID]
Control=MOS SID Controllers
Patch[0]=3VoiceSID
Patch[1]=1VoiceSID
Patch[9]=Synthcart