The Game Boy Color sound is very weak by default, with little or no bass. This is good for gaming, but musicians need better representation in the bass department. This problem can be solved with the Game Boy Color ProSound Modification, described in this document.


The ProSound modification is invented by the reverse-engineering Game Boy artist Timothy Lamb a.k.a. Trash80. The modification makes the Game Boy Color sound almost as good as the big gray model. This is done by adding a new sound output that takes its sound directly from the volume potentiometer, bypassing some sound-garbling electronics close to the headphone output.

Hear the difference!

Modifying your Game Boy Color isn't that difficult if you have some soldering experience, but if you're not confident in what you're doing, you should find someone that can do it for you. Remember, you do this entirely on your own risk, no-one will take responsibility if your GBC is wasted!

How to do it

  1. Get a soldering iron, a Game Boy Color, a pair of cutting pliers and an audio cord with a 3.5mm stereo jack in the end.
  2. Open up your GBC. The screws are Nintendo specials and quite difficult to unscrew. I used a small flat screwdriver that connected to two of the three corners.
  3. Find the volume potentiometer to the right. It has five pins. Solder the audio signal cords to pins 2 and 3 (starting from the top). (Pin 2 is left, 3 is right.)
  4. Unscrew the board and flip it over. Locate the connection under the headphone jack that's marked '4'. Solder the audio ground cord to it.
  5. Cut a small hole in the plastic for the audio cord.
  6. Close it up.


Your new ProSound output should now produce a very clean and bassy sound! If you're using Little Sound Dj, use the 'K' command frequently to kill sound. Also, you can now use your wall adapter for power, since it doesn't have that annoying "hummm" sound anymore. Note that you still have to use the headphone output for headphones, since the ProSound output doesn't have enough power.

/Johan Kotlinski (johan@littlesounddj.com)