it almost works now ! Thanks a lot

Maybe I should use Pd with JACK ? I will first read a good tutorial about JACK, actually I know only very few about it

ok, I got pd running quite normally with Jack ; the only problem are some Audio I/O errors, that correspond to some clicks

I discovered that these errors occur when I interact with something else than the running Pd patch : for example, typing this mail with the keyboard, moving graphic windows with the mouse, etc, while pd is computing audio. Inside a patcher window, there are no problems (with the exception to using some graphic objects like [array]) So maybe it's "normal" (or should I get rid off the Gnome GUI ? a lighter interface like the Blackbox could be better I think)

I start jack using the Qjackctl interface ; (of course) changing the buffer sizes of the sound card (Hammerfall) has no effect here

here is a sample of these errors :

audio I/O error history: seconds ago error type 2.55 A/D/A sync 2.73 A/D/A sync 2.73 A/D/A sync 17.90 A/D/A sync 19.48 A/D/A sync 19.49 A/D/A sync 22.18 A/D/A sync 23.17 A/D/A sync 24.96 A/D/A sync 26.12 A/D/A sync 35.39 A/D/A sync 35.41 A/D/A sync 35.43 A/D/A sync 36.52 A/D/A sync 47.83 A/D/A sync 53.25 A/D/A sync 53.34 A/D/A sync 53.40 unknown audio I/O error history: seconds ago error type 1.49 A/D/A sync 7.24 A/D/A sync 7.41 A/D/A sync 7.42 A/D/A sync 22.59 A/D/A sync 24.16 A/D/A sync 24.17 A/D/A sync 26.86 A/D/A sync 27.85 A/D/A sync 29.64 A/D/A sync 30.81 A/D/A sync 40.08 A/D/A sync 40.10 A/D/A sync 40.12 A/D/A sync 41.20 A/D/A sync 52.51 A/D/A sync 57.94 A/D/A sync 58.03 A/D/A sync 58.08 unknown ================================================================================