TBH I can't recall ever reading that recommendation about using both AC Cable + FW...
Unfortunately, I have to pay for telephone advice now (my 1 year warranty and free advice expired in May 08), and so I've been corresponding with a Digi chap called Dan via email. He has talked me through various troubleshooting measures, most of which I have mentioned in my earlier post.
Most recently Dan has suggested I try switching my processor to number 1 in the playback engine set up, which I will try when I start a new session this evening.
In the meantime, any other ideas?
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