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SECTION "Audio Callback", ROM0
; jumps to 3f:hl, then switches to bank 3d
Bankswitch3dTo3f::
push af
ld a, $3f
ldh [hBankROM], a
ld [MBC3RomBank], a
pop af
ld bc, .bankswitch3d
push bc
jp hl
.bankswitch3d
ld a, $3d
ldh [hBankROM], a
ld [MBC3RomBank], a
ret
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