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Ah, thanks for the information. Injecting the binary into some free space in the ROM then modifying the pointer seems to work.
Also, I created a GitHub repository with a Makefile that completely automates the process of assembling and injecting the binary into a ROM...
There's a typo on line 48 of your code. See here: https://github.com/angelXwind/pokemon-gen3-hq-sound-mixer/commit/be377b7540ed89a7588941348ed12fd129440669
Also, I wrote a Makefile around your code that executes the following after asssembly (BPEE target):
dd if=main.bin of="out.gba"...