nice touch on an old theme...
but... you can DIY this very easily...
piezoelectric components are super cheap..
(you can use old television/radio speakers as well to generate signals by tapping on a surface..)
the signal/s are handled through some sort of software (m4l patch for instance..)
and you can have as much pulses as your audio interface inputs..
(once upon a time.. built a "drum-set" from blocks of wood...
utilizing all 8 inputs on my sound card and this : http://koen.smartelectronix.com/KTDrumTrigger/
of course with an m4l patch can do much much more... in translating pulses to midi..
but contact mics are very interesting for noise making as well...(using their audio..)
very lo-fi... EXTRA CHEAP...http://www.youtube.com/watch?v=kKfF1kqy ... re=related
anyways ... kudos for the re-packaging and the software.. it's a nice product.. looks easy to set up too..http://www.youtube.com/watch?v=4hZPt-w6UPE
how are you assigning the tracks so the signal from the contact mic triggers the audio sample?
I'm a newbie to ableton and this seems like a mystery to resolve...