Crackling audio on my iMac.

I'm running the latest version of OSX and ever since the update I'm getting crackles every now and again on the audio. Regardless of which program it's running. It isn't a hardware issue as I have windows installed on another partition and it's fine. I'm also using an external firewire soundcard the crackling happens when i'm using it or just the standard output on my iMac. I assume it's a software issue and I was wondering if anyone else had this problem? Only noticed it since the latest update to OSX.
thanks

Yeah it does although I don't think it's the f/w soundcard as it happens through the built-in output of the imac as well.

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Crackling audio on my iMac.

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