Hi fons adriaensen wrote: I said pad not pan ;-) Well, that's an idea, but you'll be playing alone then. Because if some bassist or guitarist is around, you'll end up with a drum symphony :-) But I like your idea, and it's basically the idea of so-called guitar-synths. If you don't want to build anything though, you can also buy yourself some cheap/second hand Yamaha pads. With some quality piezo microphone and a carefully chosen playing surface, analysing the frequency in order to alter the resulting sound, or trigger different notes/samples can be interesting. In this case though, the mic would still be sticked to the surface so that you don't catch unexpected sounds. I see... "No please don't touch the coffee cup, it's exactly at 4 ms from the frying pan" ;-). Using several mics in this way can be interesting. I now have some clearer idea of a first implementation of a trigger2midi application : - It could run headless, but would have a GUI to adjust trigger settings - This GUI would generate a simple, editable trigger description text file - It would run on Jack - The settings for each trigger would be : - gain - level range, to ignore signals below and above a certain level, and possibly issue different midi program/notes according to the level - frequency range, to allow using a single mike for several triggers - midi port/channel/program/note - the source could be : - either one Jack port - or two Jack ports with a "pan range" (back in the kitchen ;-) - One could add as many triggers as needed, and the GUI would show visual meters to easily test the settings while they get adjusted. The pan setting would allow to use 2 microphones with a time difference, and should be easy to find with an automatic routine : after plugging the two Jack ports in, you'd click on a "Capture pan" button and hit an object. The difference would then automatically be captured as two values, to allow a certain position range. You could then precisely adjust the two edges of this range. I guess that with a sophisticated frequency range measuring routine, one could for example use a guitar with many triggers, to produce a wide range of sounds/notes. The Alesis D4 and DM5 devices also offer a "vcurve" parameter : that's a sensitivity curve, for non-linear midi-velocity/signal-level relations. That could be an advanced setting. Cheers -- og