Sound 00 corruption
Sound 00 corruption is a glitch effect which happens whenever the game tries to play sound 00. It can be caused by glitch textboxes which play sound 00 while the game is on bank 02 (many overworld maps and indoor maps other than caves) or bank 08 (in battle), or enabled with expanded inventory by changing item 31 quantity (wMapMusicSoundID; D35B in Red/Blue and D35A in Yellow) and getting on then dismounting the Bicycle (however the Bicycle method does not work for bank 1F, as the game will keep playing the Bicycle music). This effect was documented by TheZZAZZGlitch who elaborated on glitch text boxes and the $C414 corruption, and expanded on by FutureFractal in the GCRI Discord.
Some similar effects occur for sound bank 20. In non-Japanese versions of Pokémon Yellow (at least the English version), this is the sound bank where the Pikachu's Beach minigame, printer error, Jessie & James encounter, Yellow unused track music is located.
Effects (English versions)
Sound banks 02, 08
- $C024, $C214, $C414, and $C614 are corrupted
- $C024 becomes FFFF and is the stored return address for sound channel 8, so playing sound ID 00 with channel 8 active may cause a freeze.
- $C214 represents the coordinates of the first NPC in the map. It is corrupted to y=253 (0xFD) and x=66 (0x42). This is far out of bounds, so the NPC will appear to disappear unless the player walks to that location while avoiding map connections (possible by changing wYCoord (item 34 quantity; D361/D360) and wXCoord (item 35 quantity; D362/D361) in the expanded inventory.
- $C414 becomes 0143, causing sub-tiles 01 and 43 to appear when a text box or the start menu is open.
- C614 is in wTileMapBackup and is corrupted to 05 43, but no effect seems to be visual.
Sound bank 1F
The above effects seemingly do not occur.
Sound bank 20
For Pokémon Yellow (as sound bank 20 is invalid in Pokémon Red and Blue), using the Bicycle method and adjusting item 32 (wMapMusicROMBank; D35B) to 20 will cause the following effects.
- $C024 becomes FFFF as before.
- $C214 becomes x=65 (0x41) and y=236 (0xEC).
- $C414 becomes F041, causing sub-tiles F0 and 41 to appear when a text box or the start menu is open.
- $C614 is in wTileMapBackup and is corrupted to F4 41, but no effect seems to be visual.
Cause
According to FutureFractal, this corruption is because the channel value for sound 00 is FF; the game erroneously writes to $C024, $C214, $C414, and $C614 as if they were channel playback pointers.
YouTube video
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