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by Dwedit 872 days ago
GBA Memory Map:

  02000000-0203FFFF   EWRAM (256 KBytes)
  03000000-03007FFF   IWRAM (32 KBytes)
  06000000-06017FFF   VRAM - Video RAM (96 KBytes)
  08000000-09FFFFFF   Game Cartridge ROM (max 32MB)
The audio buffer will usually live in EWRAM, then you have to wait until about 100,000,000 audio samples have played before it proceeds from EWRAM to Game Cartridge ROM.