SNES-FM is a frequency modulation synthesis engine/sound driver for the SNES (or specifically, the SPC700). The main gimmick of it is its ability to generate instruments before playback.
- Uploading code, instrument and song data to the SPC700
- Phase modulation on the 65816 (for testing purposes)
- Basic "UI" to change the mod strength on the 65816
- Parsing the compressed instrument data
- Pitch table generation
- Phase modulation
- Pulse generation
- PCM to BRR conversion and sound
- Basic sound driver stuff - instruments, patterns and notes
On SPC700 (full list at TODO.txt)
- Modular synthesis-related:
- Tilted saw/triangle generation
- Feedback
- Mult
- etc
- Effects other than volume changes
- Extended communication with the main CPU, therefore
- Streaming samples
- Sound effects
- 4 sections in instruments
On 5A22 (in the not yet forseeable future; check out Genecyzer for a PC implementation in the meantime)
- A whole-ass tracker and a DAW (design of the latter will be completely stolen from FamiStudio)
- Saving tracker data to SRAM and sharing .srm files of songs
- SNES Mouse (up to 4 simultaneously) and NTT Data Pad (up to 8) support along with standard controllers (up to 8)
- Miracle Piano Teaching System keyboard support (up to 4 (maybe 8 if additional buttons)) (if anyone i know gets one)
- XBAND ASCII keyboard support (up to 2)
This project is made and compiled with the asar SNES compiler, specifically version 1.90. On Linux you build it with make, and there is no separate process for building on Windows, so just use e.g. winmake to build it with the same makefile. If you want use other compilers in your project, you're sorta in luck as asar (somehow) can build a binary file of just SNES-FM (in N-SPC format). To do that, call make SNESFM, and you will end up with an SNESFM.bin file in the bin directory.
This project is very much incomplete so i can't exactly recommend using it yet, but if you really need to, it is licensed under the zlib license, a copy of which is included with the project. The configuration guide can be found here.
It is being currently developed and tested on bsnes+ and Mesen 2 because of their accuracy and debugging features, so, if it doesn't work on your emulator, use bsnes, bsnes+, higan, ares, or Mesen 2.