This is the best summary I could come up with:

This was discovered recently by TheZZAZZGlitch, whose job is to "sadistically glitch and hack the crap out of Pokémon games.

It's "hardly a ready-to-use solution," the modder notes, as it requires a lot of tuning specific to different source formats.

After crashing a GBA and recording it over four hours, the modder saw some telltale waveforms in a sound file at about the 1-hour, 50-minute mark.

Later in the sound-out, you can hear the actual instrument sounds and audio samples the game contains, played in sequence.

"2 days of bugfixing later," the modder had a Python script ready that could read the audio from a clean recording of the GBA's crash dump.

That's about the halfway point of the video; you should watch the rest to learn how it works on physical hardware, how it works with a different game (an ARM code mystery in a replica cartridge), and how to get the best recordings, including the use of a "cursed adapter" that mixes down to one channel the ugly way.

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