Ghastly digital distortion while recording

I ran into a really bad problem tonight when trying to record and could use some sage advice.
I'm getting a lot of digital distortion when recording any audio on any audio track using either of the mic inputs on my Presonus Firebox interface. There's no noticeable distortion when monitoring the recording using hardware monitoring through the Firebox, but it's very noticeable on playback.
I've confirmed that this is not a gain-staging problem (the Firebox clipping indicator does not come on and the levels going into Logic were all well below -6dBFS), it's not a problem specific to a mic or to any mic, and it's not a mic cable problem either: it happens with DI'd guitars, vocals, you name it. It does not happen when recording an audio instrument, nor does it happen when playing back previously recorded tracks, nor does it happen when playing streaming music. I don't have an easy way of checking the line-level inputs on the Firebox, but if need be I can look into that tomorrow as well. I recorded with the setup successfully this morning, so the problem would have developed this afternoon or evening when I fired everything back up. And, FWIW, since running into the problem tonight I've successfully moved files to and from the Firewire hard drive I record to. If it's significant, I typically hot-plug the Firebox when shutting it down for the evening since it doesn't have a power switch .
I obviously have a nice long wait on hold with Presonus and / or Apple tech support to look forward to tomorrow, but for the meantime I'd love it if any of you could help me determine whether the problem is with my Macbook or with the Firebox. And if you are in possession of The Answer, please share it with me.
Thanks,
Trent

I've had a problem with going from GarageBand to Logic. Total distortion of audio in playback (didn't record anything new, just played existing audio). The simple fix is to open Audio Hardware and Drivers preferences and uncheck/recheck core audio. The handshake seems to take care of it. Not sure if this applies to you or not. I've a 002 rack for an interface.
Another topic: The Seatle Logic user group is meeting tomorrow night 8 pm at the University Village Apple Store. Drop in if you can and commiserate with fellow Logicians.
G5 2x2 Mac OS X (10.4.8) 6.5 gig RAM
Doug

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[email protected] Edited by dwh on 04-07-2005 04:57 PM

Ghastly digital distortion while recording

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