[LAU] Recording hiss - M-Audio Fast Track Pro, Fedora 8 CCRMA

Hello all- I've been setting up a digital audio workstation using Fedora 8 and the PlanetCCRMA realtime kernel. I've got an M-Audio Fast Track Pro connected via USB for audio and MIDI i/o. A log of my efforts is here: http://www.wavepacket.net/tomva/wl-012-mobile-daw.html Everything has worked out great so far, *except* for recording. When I attempt to record audio using the Fast Track Pro, I hear a *lot* of line noise. It doesn't seem to matter what input I use (1/4" jack or XLR), nor does adjusting the sample rate or frame count. I get the hiss recording a guitar (direct line) or mic. I don't see any xruns. The Pro appears to have some sort of noise gate? Certainly it is quiet until I start playing, at which point I'll hear the guitar plus a lot of hiss. Other parts of my sound gear don't show this symptom. Any ideas? I'm hoping this is due to bad Alsa/JACK settings and not to the Fast Track Pro. Thanks! -Thomas