Odd screeching sounds when using iChat Theater

Whenever I'm sending files over iChat theater there's a prolonged screeching sound much like the one you hear in the soundtrack of the film Psycho. One guess of mine was the volume of the speakers, but then, even when that's low, file sharing still emits those strange sounds. Any ideas what may cause them?
Mine is a PowerBook G4 running Leopard with a DSL connection. The other end uses a brand new Intel iMac.

On Laptops go to System Preferences > Sound > Input tab and adjust the Volume downwards.
If this does not work go to Hard Drive/Library/Preferences and delete com.apple.audio.DeviceSettings.plist and reboot the Mac.
NOTE: This is the Library that shows up when you open the Hard Drive (NOT the one in your Home Folder OR the one inside System)
9:56 PM Monday; January 14, 2008

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