Actually a lot of audio to midi are doing pitch on top of onset, and tempo.. some are also polyphonic; some are available as real time VSTs (are you on any of t

Actually a lot of audio to midi are doing pitch on top of onset, and tempo.. some are also polyphonic; some are available as real time VSTs (are you on any of the music dsp mailing lists? you really should be.. the prob you are doing has been handled)... The 2 minute hack to do what you guys are doing but being able to detect way more that 3 distinct sounds would be to use ableton with the following audio chain.. channel1(audio) -> looper -> vst audio to midi vst -> channel 2 (midi) set your looper to trigger the on / off recording on channel 2.