Buzzing in usb audio out (new iMac)

[ausdave]

Hi All.

Happy with my new iMac 24" 2.8, except for an audio problem thats bugging me.

When I use my Edirol UA-20 USB audio interface I get a constant buzzing in the audio out.

I don't have the problem when I use the headphone audio output from the iMac.

Any ideas on how to solve this (apart from buying another audio interface), as I really need the audio in/out of the interface.

Thanks.

 

[ausdave]

Bump.