In logic pro 7 how do I stop low volume high pitched squeal

Im using logic pro 7 with moto hd896 firewire. music will play thru itunes but won't thru logic.a message error while trying to sync audio and midi.

I don't use Logic yet, but I will. Sounds like a clocking error. Have you tried clocking to one source, and then clocking to the other and comparing the results? Those high-pitched noises are probably digital noise like what I hear on my phone when my cellphone is on too, and my computer monitor is 3' away. Did someone call your computer by telephone while you worked? Is something on?
Otherwise, how many times have you copied your session and edited the copy? after compressing something? after dithering?
Also, when a USB interface is hooked up too, and I'm recording thru Channel 2, lets say, and I set the input to "stereo", I get noise like you're talking about from the other unused channel. Try checking your input selection.
ManyToons

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