Musical keyboard and garageband: keyboard doesn't appear

Hello all. I have a yamaha PSR-37 musical keyboard and I'm trying to write a song using apple's garageband. I have leopard on an intel imac. My setup is as follows:

Keyboard-- in/out cables to a motu fastlane usb interface-- usb slot in mac.

I installed yamaha drivers and motu drivers I found with a quick google search, but the computer doesn't recognize the keyboard. Please help.

Were you able to get this to work? Because, so far - I can't.