[funkyhammond]

EDIT: Aside from the UMS glitches, it does appear there is a weird noise with the mic preamp even when using the IMM firmware. I haven't noticed it because I guess I use a fairly sensitive mic and I'm recording my band, so I never need to have the recording level past 30-35. At that level, the chirping is not audible. When I tried cranking the level to the max (64), I could hear the repeating high-pitched chirp and also a lower motor-like grinding hum. It sounds like the mic preamp is picking up noise from the internal electronics when the gain is really boosted. This is using the ext-mic mode. The line-in mode seems to work fine, though. All you get at max level is expected hiss, no weird chirping or humming noises. So a mic with an external pre-amp will probably be much better if you need sensitive recording. Otherwise, try reducing your recording level and boosting the recording later in software. Of course, you'll have worse signal-to-noise ratio, which may be a problem depending on your application.