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High Pitch Noise From Accelerator Pedal?

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Re: 2001 996TT. I'm getting an annoying high pitched noise through the stereo speakers that oddly enough seems to be originating from the accelerator pedal.

With engine OFF (key turned to the accessory setting) there is no noise until I push on the accelerator. Sound stops when accelerator pedal is released.

With engine RUNNING, the high pitched noise is a constant companion. It's a little less prominent when the stereo is on but nonetheless present (music muffling the constant sound). 
I'm wondering if anyone else has had this symptom and what they did to fix problem. Thanks in advance for your thoughts.

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As Loren suggests, we need more info.  My hunch is you have a grounding problem somewhere.

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Thanks for your replies guys!  Factory head unit, factory CD changer, aftermarket amp and speakers.  I had a car stereo technician narrow this problem down to the accelerator pedal yesterday. Amplifier was unhooked from power supply and head unit was switched off and the problem still occurred.  Could faulty electronics in the pedal itself send a high pitch noise through speakers?  Is there a list (photos?) of ground locations for this car (996 TT) that I could run down?  Would it be helpful to attach a short video of the noise to this forum string? Thanks again!!

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