Ciao Cesare,
thanks again for sharing the piece: for me (newbie) it is a good example of how PureData can be used to drive an external synth.
BTW: on Windows it worked fine at the first attempt (PD, midi yoke and "Zyn" standalone), on Linux, to stay in theme with another thread, I'm still having few troubles with the chain PD -> jack -> Zyn.. ;-) But this, I think, is just my lack of knowldge of how audio works on Linux. I'll fight it :-)
Alberto Zin