INES Mapper 019/Submapper table
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| Submapper # | Meaning | Note |
|---|---|---|
| 0 | Default | Expansion sound volume unspecified |
| 1 | Battery without WRAM, no expansion sound | Deprecated, as the PRG-NVRAM field is used for that. |
| 2 | No expansion sound | |
| 3 | Expansion sound, N163 max. ~+12-13 dB louder than NES APU | |
| 4 | Expansion sound, N163 max. ~+16-16.5 dB louder than NES APU | |
| 5 | Expansion sound, N163 max. ~+18-19.5 dB louder than NES APU |
