high frequency buzz on recording

[feyshay]

I have a high frequency buzz that seems to be evident particularly with my transients on recorded sound. Note that this buzz happened at sundry microphoned amp volumes. The amp sounded perfect, but the recording had the buzz.
My setup was this for yesterday's recording. Signal routing is as follows--I'll give equipment type too:

Electric guitar (Les Paul Standard) using both pickups>>
Fender Super Reverb amp>>
Microphones (Shure Beta 58a [dynamic] and an M-Audio Nova [condenser])>>
Presonus Blue Tube DP (I was not lifting the needle on the preamp at all--had some tube applied)>>
XLR's out to my USB Audio device (Edirol UA-25)>>
Pentium M>> Ableton Live 4
At no point (preamp, soundcard, DAW) did I see evidence of clipping. Yet, when I listened through headphones and with monitors, I have this buzz more associated with transients. Note that this buzz was with the signal from each of the microphones.
Note that I have the laptop plugged into a groundloop eliminator--the buzz happens with or without the laptop plugged in during recording/playback.
Further note that the buzz happened when I had the electric guitar feeding into the preamp and then to the soundcard. (Problem must be with the preamp, I'm thinking--too powerful a signal or something?)
1) Any ideas what is causing this?
2) Any general feedback on my signal flow.
Thanks.

[DustCookie]

I've heard this buzz on transients as well, but only when rendering my 24/96 recordings to a lower bit/samplerate like 16/44.1

My gain stages are fine, and I'm using a AT 4050 (condenser mic) into the presonus Firepod which sounds great. I'm also on a P4-PC.

weird crap eh...