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The mod runs in Full mode (all the sound processing) or Battery saver (low power, longer playtime). Switch by holding the R button on the console until the third chime, then releasing.

Drop in an MP3, M4A, WAV, OGG or FLAC and it's converted to the mod's clip format in your browser, never uploaded to a server. Leading silence is trimmed, then the first 4 seconds are kept and the level matched to the built-in chimes. Sending it replaces whatever the Custom startup sound is now, including the one the mod shipped with.

Hold the console's R button; it chimes as the hold passes each step. Release on the chime you want. Raise these if R gets bumped during play.

The four signals that run from the mod board to the Game Boy through the flex. If one reads open, the pin named beside it is the place to look.

Installed firmware: —

Update the mod over Bluetooth. Get the latest firmware.bin, drop it below, and keep this page open until the device reboots. Audio pauses for a minute or two.

The device's live log, plus the same commands as the wired console (help, get, batt, nr, …).