Well I'm actually making more of toolkit for do it yourself modular live sequencing systems. So the idea is that one might use parts of it on PC, port parts to Pic chips, or run parts coded in something like Csound or PD. At the moment the whole thing is a gigantic Csound ensemble heavily tailored around my own personal gear set up, so I haven't had to worry about any low level stuff yet. But I would like to start modularizing it and making it available to other people and platforms. It works well in Csound, but file i/o is kluderific so I'd like to get that kind of stuff going in C as well. Thanks, Iain