Bravo Jcfitn et merci pour le partage.
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@clint yes! thanks for the tip, I will take a look to this soft, I was searching something for Linux (my main/audio system), and I didn't found, I will try to bridge this program.
The avantege to have something buld in is using hardware synth or raspberry that now is a chose for a lot of musiciens in live situation (better than have a "real" computer conected).