Multiple usb inputs

I am new to mac products and garage band.  I am trying to connect two instruments to my MacBook Pro via the available two USB ports and record both simultaneously.  When both are plugged in, the Mac system recognizes both are plugged in, but GarageBand only shows one available.  Any suggestions for multitrack recordings via USB inputs would be appreciated!

edgeevans wrote:
I am trying to connect two instruments to my MacBook Pro via the available two USB ports and record both simultaneously.
assuming you are using audio interfaces (not MIDI instruments), you need to first create an Aggregate Device:
http://www.bulletsandbones.com/GB/Tutorials.html#allaboutaggregatedevices
(Let the page FULLY load. The link to your answer is at the top of your screen)
then you can record on multiple tracks:
http://www.bulletsandbones.com/GB/Tutorials.html#bsqrecordmultipletracks
(Let the page FULLY load. The link to your answer is at the top of your screen)

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