no help here, but mine does the same thing. started after ( i think, at least i never noticed before ) i replaced the serpentine belt. a few weeks ago i took the belt off and put it back on. seems to be a lot "softer" now and i barely notice it. i'm wondering if it might be a pulley getting old or tensioner going bad.
like you it's a steady chirp when idle, gets faster when i accelerate and eventually either goes away or gets drowned out by the other engine noises.
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"Speed has never killed anyone, suddenly becoming stationary... that's what gets you."
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