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Since this only appears to be happening when the engine is idling, what you're hearing most likely requires something to be spinning. To narrow it down, the clutch IS spinning, always, because it's attached to the engine; this is one possibility. When you engage/disengage it from the tranny, the only part it's affecting is the input shaft; the second possibility. Since the gears are helical, when one shaft turns it tries to corkscrew itself forward or backward against the mated gear. Since no gears are engaged in neutral, we may be hearing the near-instantaneous force of acceleration on the input shaft, and the drag caused by the thick tranny oil slowing it down quickly. Considering this car has had extreme efforts put into engineering it's transmission "feel", the noise may simply be a byproduct of the bushings or shifter linkages making a normal action become more audible.
I wouldn't necessarily suspect a throwout bearing I'd expect to feel and hear it pitching a fit with the pedal depressed.
When you move the clutch in/out more slowly (say 2sec in, 2sec out) does it still make the noise?
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