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Turbo whine?

Greetings all,

I'm getting an intermittent whine while on boost on the '93 S4. It is a high
pitched whine that increases in intensity (slightly) as boost increases. I
have not been able to isolate where the noise is coming from, as well it
happens under most ambient conditions. I don't seem to lose any boost as I
get he same readings on the VDO gauge whether the car is whining (no pun) or

Not terribly annoying, I would, however, like to know if this is the death
knell for something under hood. Any BTDT's? I did a vacuum test, with no
leaking in the vacuum hose system.