an attempt to mimic the NES soundchip with custom waveform instruments. transcripted from FamiTracker.

PICO-8 has this strange, finnicky bug when exporting SFX with custom waveforms, so for pretty much all of these i had to manually adjust the hexadecimal export code to fix them.

Super Mario Bros. 2 - Title

i just couldn't replicate how this one sounds perfectly. something about how the waveforms combine in the NES soundchip is either unique, or i'm too dumb to figure it out.
[sfx]

Super Mario Bros. 2 - Character Select

[sfx]

Metroid - Title

decided to use a custom triangle instrument in this one.
[sfx]

Metroid - Brinstar

the "Drop" effect can be used to restart a custom instrument at the same pitch, instead of continuing the note.
[sfx]