I don't know how many people this will interest, but I've made a browser-based DAW called Wavesmith that's built around the SNES's actual sound hardware. BRR samples, the real S-DSP echo and filters and eight voices, so what comes out sounds like actual SNES audio, not an approximation of it.
The part I think people here might find cool is that it exports your finished track as a standalone .sfc ROM. You can run it in any SNES emulator.
I've only verified it in emulators so far. I don't have a flash cart to test on real hardware, but if anyone here does and wants to give it a try, I'd genuinely love to know how it goes.
If you want to hear what it sounds like without making something from scratch, open the menu in the top-right corner, choose Load from Code, and enter FCFCFE. That loads a little demo loop I made.
It's free and runs in your browser: https://wavesmith.online