Hello, Another user struggling with his Quattro here. I've tried it on three computers with Mandrake 9.1 and then again with 9.2beta2 on one and whenever I plug it in / turn it on it crashes the machine. If I leave it plugged into the computer when I boot, it gets so far and then says [<e08b56a4>] snd_hack_usb_set_interface+0x14/0x20 [snd-usb-audio] about fourteen times, followed by Code: 8b 02 85 c0 74 06 8b 02 74 06 81 c1 00 08 00 00 8b 52 <0>Kernel panic: Aiee, killing interrupt handler! In interrupt handler - not syncing. Then the lights on the keyboard flash very prettily and the pc won't do anything else. I've tried blacklisting audio usbaudio and usb-midi (because they should start with snd- if they're alsa, right?) and it still crashes. I'm going to try and see if I can install a newer version of alsa, but i was also wondering if there was anything else I could do / look for or if anyone else was having the same problem. Incidentally, on the same machine, knoppix 3.2 reports Soundcard: M Audio USB Audio Quattro driver=audio (so not alsa?) Any help appreciated Chris Butt.