[linux-audio-user] Still some issue with Edirol UA25

Hi, I have fixed the two preceding problems discussed on alsa-user mailing list (1: "advanced mode" switch on lead to card not recognized. 2: lot of clip/distortion on output). These problems was solved by updating alsa kernel modules and alsa lib to 1.0.10. I'm am using ardour with jamin as insert on the output master track. And now, i'm facing a new issue, i get sometimes (often) lot of xruns, leading jack to stop and ardour/jamin to crash! jack says: Lot of messages like: **** alsa_pcm: xrun of at least 0.029 msecs and finally: jackd watchdog: timeout - killing jackd Jamin says: zombified - calling shutdown handler Ardour says nothing. I get only this behaviour when puting jamin as an insert on out master track in ardour. When removing the insert i can get all the stuff working well. Before switching to this external USB sound card, i was able to play my ardour project (with the jamin insert) without problems... (built in ugly PCI sound card) I guess, jack get lot of overruns mainly because of the USB, but i'm not sure at all... Does anyone know some nice jack parameters that suits the use of such an external sound card? Regards, Christian