A. Brian Battles suggests this as a possible fix for MobilePre users:
If you are getting a noisy recording when using an M-Audio MobilePre USB interface with GarageBand try the following.
You will have to do this every time you launch GB. You may find after recording for some time (has varied and seems to be a shorter time when there are more tracks and/or effects) the noise will return. I had one file start to create the noise every time I created a new track. If any of these cause the noise to re-occur, re-use the method above.
Also, being a USB connection, you may find that GB will respond more slowly over time during a recording session. Save your file (project), quit GB, re-launch GB, and re-use the method above.
Was this information helpful? Yes / No
GarageBand from Apple Computer uses audio loops and MIDI loops in Apple Loops format. It can work with Audio Units plug-ins. Apple Macintosh Compatible FireWire and USB interfaces can be used to connect Audio and MIDI instruments to your Mac, and be recorded into GarageBand.
New Album T-Shirts GB Downloads LiveCode GarageBand FAQ