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The high pitch noise is caused by the backlit within the screen itself. All handheld devices have this problem (except sidelit devices).
To test it out turn the backlight setting on your screen to the lowest setting (which isn't off); and put your ear to screen of the Axim. You should notice that the noise is lowered significantly.
As for speaker problems: do a soft reset; after alot of prorams are used and alot files go through media player I find the sound quality goes down. All is solved with a soft reset.
There is a technical answer for why the devices do this; but I never really cared to ask. Possible electro-magnetism?
Another issue: when the device is supposedly on mute. You might still hear a sound after tapping the screen to select a menu (somewhat like a speaker blip). Only way I found to solve this is to turn off all the audio settings.
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