Garageband - Is it possible to use 3 USB mics?

Posted:
in Genius Bar edited January 2014
I am doing a podcast where I need to use 3 USB mics. I have used the Audio MIDI Setup to aggregate the 3 mics into one and I then select it in Garageband. However, only two of the mics are picking up any sound. I am 100% certain that all 3 mics are working when used individually but it seems that the aggregate device editor is assigning one mic to the left channel, one to the right and the other one is not being used. Is there any way around this without buying a mixer?
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