How can I get rid of feedback in Garageband?

I am using Garageband 09' (version 5.1) with a M-Audio Firewire Solo. Whe I connect the microphone with an XLR cable, it works fine. However, when I connect the acoustic guitar (I'm using the Dean Markey transducer for my pickup), it's not very loud, and when I turn the volume up to get any decent volume, I am always getting some feedback. I've tried different patch cables but I'm still getting feedback. This is so frustrating. When I play with the recording level in Garageband, it doesn't change. It changes when I adjust the level on the Firewire Solo.

Anyone have suggestions as to how to fix it? The Firewire Solo is old....it's from 2006. So I wonder if that's the problem. But I wonder if I can solve this without needing to buy something new.

You might need a pre-amp for the guitar. Is the Solo fully grounded and/or shielded? Looks like a plastic case in the pics on Google.

I don't know. how can i check? I do know when I put my hand on top of the Firewire Solo the noise goes away.

oxband said:

I do know when I put my hand on top of the Firewire Solo the noise goes away.

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Bingo! Probably not fully shielded. Check the owners book or ask at the web site. See if there's anything you can do.