Hey guys, I have a 1.42ghz MDD PM with a yamaha ypt-300 and a midi/usb cable that supposedly doesn't require any drivers. The cable shows up in midi audio setup as well as in my usb preferences tab, and garageband says that "1 midi device is connected", but I can't seem to make any sounds through the computer. I try to set up a software instrument but nothing plays. Am I right in assuming that any software instrument should be able to be controlled through the keyboard with no further setup? Any help would be appreciated.