I don't use garage band, so take this with a grain of salt…but you should be able to adjust the input gain somewhere. It might be in the Audio/MIDI Setup Utility or in GB's preferences somewhere. Turning up the channel volume wouldn't do anything, because it just adjusts GB's playback volume.
The Audio MIDI Setup should have an input gain control for that sound card…if GB doesn't have an input gain somewhere, use that.
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