Thanks Mark!

I'm going to take out my debug lines, give up on the laptop and rely on the Hijack display. That way I know it should work and there are less things to go wrong.

In theory I should be able to do a simple test with the tuner stalk socket. If I unscrew the cover on the connector and short out the cable connection points for the collar and tip I'll see the Hijack display show the button code Stalk=0x01 and/or turn off the player... right?