Tried it with my Sony PSP. A bit of an awkward fit for the Transmitter, but it fits without the iPhone type jumper wire.
No high pitched buzzing. Just the white noise. Much better in this case. But I think my celebration is short lived as the Transmitter went to sleep and then after I pressed the button to wake it up, the high pitched buzzing is back.
I wonder if it get interference from 802.11 WiFi signals or my FemtoCell (Sprint Airave), which are within 2 meters of my listening area. Time to wander outside....
-Ed