It never ceases to amaze me what wonderful retro projects people come up with in this forum. Splendid work, Stiletto "Tube Time"/schlae! 😀
However, I'm a bit weary about that firmware image in your repo. It's copyrighted and although it is more or less abandonware, I don't think it can just be distributed without approval of the owner(s).
Perhaps one of the many different former Sound Blaster clone manufacturers could be convinced to publish the source code of their Sound Blaster clone firmware (or at least officially release the firmware image as freeware) now that those cards aren't being sold anymore, provided of course that they wrote their own clean-room implementation without having pirated another firmware themselves.
It would be even more awesome to have a newly-developed-from-scratch open source firmware for the 80C51 that would provide (near) 100% compatibility with Sound Blaster 1.5 and/or 2.0 cards. Perhaps even a firmware that would be superior to the original Sound Blaster firmwares, avoiding the flaws of the original products while still providing 100% compatibility in games. That would be a nice separate GitHub project, the fruits of which could then be combined with the Snark Barker. And additionally, it could then perhaps also be used in other retro sound card projects and/or in emulators and such. 😀