exactly the same set up for me as wel 909one, had a freind w/ the same situation. interface, fw drive, dual g5. He got around it by lifting grounds on his monitors oddly enough. Seems to me to be RF induced into the jacket of the FW cable, due to drive spin, or maybe even processor cycling.
The fw drive thing seems to make sense, too, though my logic may be flawed. Being that the noise I often hear is sweeping up to around the 7k range (7200 rpm drive)...am I crazy? I have an internal SATA drive for most of my audio work though, so my external drive is oftern just idling. This may explain why I only intermittently hear said noise, because my drive is only sometimes in use. Maybe we should try yanking the external drives and see if it goes away. Is it possible that if we have interface in front FW port, drive in back, or vice versa that we're getting a voltage difference over the FW jacket, since the FW drive is AC powered as well?
Secondly, I've started to run my interface off of the front port on the G5, and it seems to improve the noise issue.
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