I have a Yamaha DGX-200 keyboard that I've had for a couple years. It has both a MIDI in and MIDI out port. Now that I have iLife 08 I've become interested in using Garageband with a keyboard. Would it work with a keyboard like this? Most of all, how do I connect it? I know the Mac doesn't have a MIDI port but there seems to be a lot of MIDI-USB adapters. Is there a certain one I should look at?