Messy 'pixalated' distorted sound from multiple interfaces

I was just about to send my Apogee Symphony card and Apogee Rosetta 800 back to Apogee to repair because I have been getting this really nasty distortion sound across all audio coming out of the computer, even in iTunes or whatever. If I turn the unit off and back on again, it will work clearly for 10 or 20 minutes, then it just clicks into this distorted sound. So... I've been using an M-Audio FireWire 410 for the past couple of weeks without incident, and then the other day, it made a small 'pop' noise, and started playing that same distorted playback. If I turn this unit off and back on again, it will play fine for a couple of days, but it has been 'popping' and then playing back distorted off and on. Does anyone have any suggestions? I know this isn't Logic specific, but I'm in Australia, and sending stuff to California for unnecessary repairs will get costly. Thanks in Advance.

thanks for the help... I was using both interfaces together for about 6 months, with no issue, and the clocking was set for the apogee to be the main clock and the M-audio box to sync to it. I have tried using just the apogee box and clocking to its own clock but the problem persists.. could be the update.. when I left the U.S. 2 months ago, all was good, as soon as I hooked the gear back together in Australia I started getting this problem.. I'm sure I just installed the OSX update with the auto installer function. any other suggestions now that you know a little more?
thanks again, you guys rock.
dp

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eldalion wrote:I tried seting up dmix "the old way" using /etc/asound.conf (hey, you never know) but no luck either.
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log_file "~/.mpd/mpd.log"
error_file "~/.mpd/mpd.error"
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* Update mpd.conf from upstream
- Configure an ALSA output by default
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Messy 'pixalated' distorted sound from multiple interfaces

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