Clemens, > Probably you should just deactivate bandwith checking in > the kernel config. I did disable [ ] Enforce USB bandwidth allocation (EXPERIMENTAL) [ ] Dynamic USB minor allocation (EXPERIMENTAL) and now I can run my USB card with 156 F/p instead of 512 3 Periods/Buffer and qjackctl tells me 16msec latency!!! I can immediately feel the difference by playing Aeolus or Zyn! In Zyn, when playin a rhodes sound and using the hold pedal, I get a lot of noises, but I guess it's a Zyn bug. If this persists then this would be almost three times as fast than before! Clemens, that's like Xmas! I'd like to express my deepest thanks that you shared your worthy knowledge with us. I guess Frank Barknecht will be happy as well :) . Thanks a bunch! Best regards ce