Many Thanks
for the help. I have succeded in running real-time midi from a keyboard,
but had some clipping. I beleive it's my machine which is slow (it's a 604 ppc at 120mhz without any soundcard) In fact it's the mac's sound manager who is managing it all.
  Is it the processor, or the mac's default sound card??
    Anyhow it'sq good to know that you can do lots & lots of stuff
with Csound on any platform with wathever background you have (I mean experience!)
So long life to Csound!
    Thanks again all of you
    Karim

http://perso.club-internet.fr/karmha/