USB Audio Distortion After 10.4.6 Update

Have been using an Edirol UA-1D USB/Digital Audio interface with my Pismo for years. Optical connection for audio out to digital 8 track unit. Crystal clear signal. Painless operation. And NO drivers needed.
Updated from 10.4.5 to .6, and instantly I'm hearing a considerable and disturbing amount of distortion in the audio. It's not volume dependent or overmodulation (comes through even at low input levels). And it comes through iTunes, Reason, LIVE, etc... where it didn't before.
Since the Edirol unit uses built-in Core Audio, I'm baffled. I know Apple has been endlessly tweaking its OSX USB/Digital audio underpinnings, but I fear this latest tweak has knocked something out of alignment.
Any suggestions?
I zapped PRAM, "repaired" permissions, etc. No luck yet.
Would appreciate any insight.
Thanks in advance.
B&W w/G4600 - Pismo Mac OS X (10.4.6)

I have been having similar problems with my (much less fancy) USB speakers, intermittently, since the 10.4.6 update (PowerBook). From another post I made elsewhere:
I have Altec-Lansing XT1 USB speakers. They're connected to the PowerBook via a USB KVM, to an ADC, to the speakers.
For the last week or so (it started soon after 10.4.6 upgrade), an odd temporary sound distortion has been occurring. As the original poster mentioned, it sounds for the life of me as if the speakers are blown.
For anywhere from a few moments (several seconds) or longer, the sound output will become distorted in this way. Then, often of its own accord, things will go back to normal. If I want to get them back to normal more quickly, I can mute and unmute (I use a Logitech keyboard with a mute button, or sometimes I hit the Griffin Powermate which defaults to mute, and occasionally I even hit the sound control on the menu bar). When it's unmuted, it comes back undistorted.
Hence, this phenomenon seems to me to likely be software-related.
I almost always use the PowerBook closed and hooked up to an ACD. Lest you think this is particular to this set up: I have another identical ACD & speakers at the office (indeed, even the same keyboard), with the main difference being the lack of the USB KVM switch being left out. The problem happens there as well.
I welcome any thoughts.
Thanks,
Doug

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I have been having similar problems with my (much less fancy) USB speakers, intermittently, since the 10.4.6 update (PowerBook). From another post I made elsewhere:
I have Altec-Lansing XT1 USB speakers. They're connected to the PowerBook via a USB KVM, to an ADC, to the speakers.
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For the last week or so (it started soon after 10.4.6 upgrade), an odd temporary sound distortion has been occurring. As the original poster mentioned, it sounds for the life of me as if the speakers are blown.
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