sure - basically you want pitch-detection of the
audio-input (and maybe
envelope/volume). Just getting a single pitch (base-freq) is not too hard.
Thanks
for the detailed answer, i think that's what I'm looking for, a
"pitch follower" or "envelope follower".
I already used puredata, I'll try what you said, and see if i can get
something to work, if i encounter some problems I'll ask back,
if there are more suggestions about other methods i'm listening,
thanks again,
bye
Al