Try enabling sound prefs.
Hi,
iam on BackTrack 5 R2 with my M-Audio MobilePre USB and Sounds are working great after i went through this guide: http://www.backtrack-linux.org/forum...ad.php?t=40271 and disabled my onboard soundcard in Bios. Now when i reboot a notification pops up with the message that my USB Mobile Pre does not work anymore and PulseAudio will be used. in my Phonon Settings no Soundcard will show only PulseAudio Sound Server. Everything is ok for me now, but that Sounds starts to get ugly when other sounds are payed and i have to stop playing, whait a bit and start again playing is a bit annoying.
if it helpes: it sounds like a pitched up and distorted
Try enabling sound prefs.