USB sound card sound drop outs and glitches

Hi there, I have been using a Lexicon Omega USB sound card with my Macbook Pro unibody and have been experiencing a failure when running two programs that try to output sound.
e.g. iTunes will be constantly playing music and another program such as safari pings me when I have a Facebook chat message or if there is a sound when a file has finished copying or i try to play a youtube video at the same time or I play a track in spotify, the sound card freaks out and makes clipped distorted noises then stops outputting sound to the amp and seems to stop receiving a USB signal.
The curious thing is that after reconnecting the usb cable, all is fine again and both programs WILL play simultaneously, so it should be possible?
This is really starting to drive me a bit mad as I cant play music and chat online at the same time without the sound crashing.
I presume it has something to do with what program is assigned to the core audio driver and another program confuses it, like when running Logic Pro which seems to take over the whole sound card for its functions and won't share.
Perhaps there is something in OS X I could fix or change to get round this or perhaps its just the sound card not working properly and not the fault of OS X.
Would be grateful for any advice or if anyone else has this issue.
Harvey

I presume it has something to do with what program is assigned to the core audio driver and another program confuses it, like when running Logic Pro which seems to take over the whole sound card for its functions and won't share.
Be absolutely certain that all of your 3rd party software is fully compatible with Snow Leopard - visit the manufs. sites for updates & info until you're current, etc.

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