HORRIBLE BUZZING/HUMMING WHEN CONNECTING SYNTHESIZER TO GARAGEBAND?

Hi! I want to connect my synthesizer to garage band so that I can use it as a live instrument when recording. I have a MobilePre USB from M-Audio. I just sent for an Imic, and I just bought a guitar cable adapter today from Griffin. Ok, when I use the M-Audio I get a horrible hum. I've tried different wall outlets, different volume settings, nothing works! When I plug directly into the computer using the guitar cable adapter I get a buzzing sound. It's the same kind of sound you might get through a guitar amplifier when you are playing live. It's infuriating!! If I would have known that this was going to happen I would have never invested the money. Is this what happens with all instruments that have their own power? Will the Imic get rid of the buzzing? DOES ANYONE KNOW WHAT I CAN DO PLEASE? HELP! Thanks, Jim.
Power PC G5 dual processor Mac OS X (10.4.3)

try plugging it into an amp, and see if you get the same results. With the Mobile Pre, you didn't need to get an iMic or that cable stuff. The Mobile Pre is a better usb interface than the Griffin stuff. If you still get the noise through an amp, then try a different cable. You shouldn't be getting that with any instrument. There's a problem somewhere in the chain. You'll have to test each link in the chain to try and locate it. Do you have other instruments you can try?

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HORRIBLE BUZZING/HUMMING WHEN CONNECTING SYNTHESIZER TO GARAGEBAND?

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