So I recently bought a $10 MIDI to USB adapter off of Amazon and I hooked it up to my PS3 RockBand Keyboard because it has a Midi Out. If anyone is familiar with the keyboard, when you hook up the keyboard to your computer via USB & MIDI, the four red lights (indicating player number when turned on with a console) would just light up telling you that you're connected. My RockBand keyboard however, for some reason, won't recognize that it's plugged in, and those four lights would flash (indicating that it's trying to find a connection). I've tinkered around with Audio Midi Setup, but nothing seems to be working there. Could it be that my USB to MIDI cable is faulty? Or do I have to install some sort of driver? I'm trying to set up this keyboard with Logic Pro. Also the Mac I'm using is a Late 2012 21.5 iMac, 2.9 GHz i5 with 8GB of memory.