Buzzing on playback

I've just upgraded to Garageband 11 through the app store.
Playback through my Edirol FA-66 is badly distorted.
On garageband startup, playing a song, or previewing a loop just produces buzzes
If I use the Garageband prefs to select the FA-66 as an output device, which resets the driver, it plays but with a lot of distortion.
If I output to the mac's headphone port - it all works fine.
Logic 9, Reason, iTunes, Soundtrack pro and Sibelius all play fine through the FA-66.
Previous version of garageband was fine.
I have run the permission fixer and deleted the pref files (and they recreated successfully) without any improvement.
I also deleted and reinstalled Garageband through the app store. Again no difference.
Any suggestions?

Not sure this makes sense.
I just installed the drivers for a PCR-M50 keyboard....
Garageband now works fine. (no the keyboard wasn't connected before)
I still have to swap the driver in garageband preferences to internal, and back to the FA-66, to reinitialise the driver....
but it is now fixed.

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