Hey travellerboy,

If the computer can access the files on your yamaha from your usb connection or if you can export those files as wavs to any folder on your computer then you should be able to "import" them into RB as .wav files. From what I understand, and if I'm wrong someone will correct me, you can also do the opposite by exporting your RB files as wavs then importing them into the yamaha if it allows you to do that.