I decided to send my USB Midisport back and exchange it for the Portman serial interface. If that doesn't work, I guess I'll just have to save up my pennies and buy the AMT. It's more than I need, but at least it's reliable. We'll see how this serial version works. Of course, it'll be three weeks before Musican's Friend turns this around, but I'm taking the holiday's "off" anyway.