Hello, I'm trying to use MIDI to learn how to play piano, but the keyboard I purchased on amazon doesn't seem to be working. It's a MIDIplus AKM320 that came with a USB MIDI wire that I've set up and connected to my macbook air. The problem is that I have no idea why, when I go into garageband and select the option to plug in a MIDI keyboard, nothing happens when I press any of the keys on the thing. I thought it could be the wire, but it seems to light up and indicate that it's on whenever I plug everything in, so the wire seems to be functioning. I've also gone into the audio MIDI setup and added it to the MIDI studio and it still does nothing. I've pretty much searched everywhere and found no solutions to the problem I'm having, so could it be the keyboard itself? looking for anyone who might know what's up with it, thanks.