If I remember it correctly, Bernie used a Kenton USB host to connect his controller to the SD40. Col, were you referring to the WIDI Bud I had talked to you about when you said your midi Bluetooth adapter didn't work? I happened to pick up another Widi Bud just last week, the only Bluetooth midi receiver in the world as far as I know. While I was updating my SD40, I tested the Bluetooth MIDI connection. It works just fine with my Korg Microkey Air. I might add that the SD40 is rather picky when connecting external USB devices. Make sure you connect it first before powering up the SD40.