EXS 24 Logic Sampler Users Group

As Gordon allready said, "Audio to MIDI Groove Template" is what you want.
Unfortunately this is only working with recorded material. Not sure whether there's proper plugins (such as the one Peter
recommended) doing a good live job. From my experience they don't. I'd rather use some piezo trigger and *whatever* hardware device
(there's cheap ones, even my old GI-10 MIDI guitar converter has a monophonic audio input).

- Sascha