Dan.2000, I've looked into it and I'll definitely consider the SD2. The next thing I'm going to try tomorrow night is to connect the Midi out of the Ketron into the Keyboard (midi 2) input because when I played the midi file from the computer into the midi2 port, I got the good Ketron sounds.

bzw, I hadn't actually tried that - thank you. Unfortunately these are also general midi sounds on the SD1 (according to the menu and what I hear when I play the midi file).