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:
- Not really an audio guy, may still be glitches
- Looping only goes back to the start of the tune, rather than part-way-through as in some songs. Probably would need to decompress the songs to pico8 memory to do that, instead of my "clever" on-the-fly RLE decoding
- Noise channel is emulated (apart from the "periodic" noise feature), but I didn't bother recording the register from the VGM file so it only uses frequency setting zero.
- Bit loud
- Scope placement/colouration makes it look like Alex and Blaze are having some sort of Electric Urine Battle
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