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Table of Gain Modes
From SnesLab
The S-DSP has five gain modes, to which Nintendo gave official names [1], but they are numbered differently by different emulator authors.
nocash numbers the gain modes with bits 5 & 6 of VxGAIN. [2] Note that direct gain mode uses these bits for the fixed volume instead and thus has no number in this scheme.
Near numbers the gain modes with the top 3 bits of ADSR(1).[3] Note that when bit 7 is clear, bits 5 & 6 are "don't care" and thus Modes 0-3 are actually all the same - direct gain.
| Official Nintendo Name | nocash numbering/naming | Near numbering/naming |
|---|---|---|
| Direct Designation | Direct Gain | Modes 0-3 (direct) |
| Increase Mode (Linear) | Mode 2 = Linear Increase | Mode 6 (linear increase) |
| Increase Mode (Bent Line) | Mode 3 = Bent Increase | Mode 7 (two-slope linear increase) |
| Decrease Mode (Linear) | Mode 0 = Linear Decrease | Mode 4 (linear decrease) |
| Decrease Mode (Exponential) | Mode 1 = Exp Decrease | Mode 5 (exponential decrease) |
References
- [1] page 3-7-4 of Book I, "GAIN" of the official Super Nintendo development manual
- [2] https://problemkaputt.de/fullsnes.htm#snesapudspadsrgainenvelope
- [3] https://github.com/ares-emulator/ares/blob/master/ares/sfc/dsp/envelope.cpp