I'm using ArtWonk (Algoart.com) to create 'music'. I can select MIDI channels 0-15 for output. Channel 9 is 'reserved' for Percussion Sounds by convention. (the synth "knows" if it is channel 9 that it should 'play' "clapping hands" instead of Eb on a piano). Problem is "SWITCH" doesn't convert MIDI Channel 9 'notes' properly.