Heavily inspired by this
A Master System/Game Gear sound chip emulator in Pico8 using the PCM channel. Features 4 songs from SOR1&2 for the Game Gear (use left/right to select)
How it works:
VGM files are logs of register writes. I wrote a program to decode them, save what the reg settings were every 60th of a second, and RLE compress them into strings. The sound chip is basic enough to write a simple emulator for Pico8.
Limitations: