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http://groupees.com/remute

edit: wrong

Hey, I haven't used this backlight but looking at the photo on the kitsch-bent store the terminals are marked B, R, G and A. I assume A stands for anode, i.e. this is backlight uses common-anode LEDs.

So A should be connected to +V, then whichever of the RGB colours you want lit connected to ground.

No. The volume control is a potentiometer.

Looking at the 6N138 datasheet, pins 1 and 4 are NC, not connected to anything, so can be left unconnected. Pin 7 is connected to the base of the 6N138's output transistor and should be left open. If you ground pin 7, the Arduinoboy won't work.

The code that handles the MIDI status byte checks for a match between the incoming MIDI channel and the channels for MGB (PU1, PU2, WAV, NOISE and POLY) stored in EEPROM. In any case the status byte (midiData[0]) sent to GB has its lower nibble set to 0 for PU1, 1 for PU2, 2 for WAV, 3 for NOISE and 4 for POLY.

e.g. a CC instruction for PU1, controller 1 with value 127 would send B0 01 7F

Did you change audio settings in config.xml, or just use defaults? I've tried a number of settings on my Pi 2 B, but haven't got lgpt audio working smoothly.