Connecting and Using Korg synthesizer module to GB

Hi, I wanted to use my Korg X5DR synth within GarageBand.

I have it connected via a MOTU FastLane MIDI USB unit. My Yamaha keyboard is also connected through the FastLane. My Yamaha Keyboard works fine, and the FastLane is showing both devices transmitting, however I do not know how to actually get the Korg unit to "talk to" GarageBand.

I used to use Digital Performer, and you could select the synth from the drop down menu...

Korg site was useless, only offering a Windows driver...