The SNES is a 1990s game console. Its music is generally synthesized by the SPC700 chip, from individual instruments stored in 64 kilobytes of RAM (so the instruments often sound synthetic and muffled). The advantage is that it's possible to separate out instruments.
Either:
- Programatically gather a list of all samples used in the song
- Generate many modified .spc files, each of which mutes 1 sample via editing the BRR data.
Or
- Use a modified SPC700 emulator which you can tell to skip playing a specific sample ID.
Record the original song to .wav. And for each sample, record "the song with one sample muted", and take (original song - 1 sample muted), to isolate that 1 sample. If the result is not silent, you have isolated 1 instrument from the original song.
The results may not always be perfect, and will need manual labeling of instruments, or manually merging together multiple piano instruments. But I think this process will work.
BTW, in the play-along mode in GB where you get pre-recorded accompaniment tracks, you can replace the drummer's kit with a drum machine and hang some filters onto it. Much fun is to be had.
However, this reminds me that filters probably make things much harder for the separation model, with the explosion of possible sounds from an instrument or voice. (Vishudha Kali's music is a nice illustration of that.)
I did come across the person who did a similar project (automating instruments based on previously recorded music), however in one project that was playing live instruments from an NES, the signals were already separated. That said, I'm not following the context of your response to my post.
You mentioned that "the biggest hold up is getting enough properly trained data, tagged appropriately, in order to let the models train correctly." I think using SNES music as training data is a viable way of getting hundreds of songs' worth of training data in a fairly automated fashion. (I'd estimate that each game has 10 to 80 songs which can be used for training, I have 5 to 10 games of OSTs already downloaded, and each song is only 64 kilobytes and takes minimal disk space before rendering to WAV.)
Either:
- Programatically gather a list of all samples used in the song
- Generate many modified .spc files, each of which mutes 1 sample via editing the BRR data.
Or
- Use a modified SPC700 emulator which you can tell to skip playing a specific sample ID.
Record the original song to .wav. And for each sample, record "the song with one sample muted", and take (original song - 1 sample muted), to isolate that 1 sample. If the result is not silent, you have isolated 1 instrument from the original song.
The results may not always be perfect, and will need manual labeling of instruments, or manually merging together multiple piano instruments. But I think this process will work.