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The Sega CD operates in a variety of modes alongside the Megadrive's Z80 and YM2612. There are 2 main modes, one of which (popularly used Mode 2) is mainly the WAV files playing alongside the executable game files (for instance, each level of Sonic CD is its own unique file, each having the core graphics, engine, etc).  All of these files are on the disc, and it is the only storage medium used to read files from.

The problem with this is that the Megadrive has 10 channels natively, and the Sega CD adds an additional 10 (8 PCM, 2 CD digital audio). Most of the music for games was entirely WAV files, as whole songs (not like tracker samples, interestingly enough). So games like Sonic CD, you cannot find FM patches for because they were only for things like some sound effects, if anything at all.

Chaotix was for the 32x which introduced (I believe) another 4-6 PCM channels. These sounds are possible to extract and port to the Genesis.

As for BIOS sounds, they are bin files that as far as I know are each their own unique beasts. Since most feature simple background loops and simple instrumentation, it can be inferred that the music was hard-coded rather than played through a preset "player." The audio is PCM for all of them, if I recall, and it should be possible to copy the instrument parameters from the registers for the PCM channels.

It has been a few years since I dabbled hard in the Sega world, but this is what I know for a fact.

European Model 2's.

Also, make sure you aren't using a crappy power-only mini USB cable for charging devices. I have had those pose a problem before.

For reference, it was the best drink coaster I have ever owned.

I've thought about it for months. Hardest thing would be making a few breakout boards so stuff like shoulder buttons, etc would happen. Do go for the GBC case as it is still a huge step!

As someone that's got a few years of jazz bass under their belt, I'd advise you actually have a few instruments and tables with slightly different tables. Include some rad slow pitch bends and some dynamics (E00 to E03) as well as livening the arrangement up with the fills, and your track will definitely get some extra groove to it. Not to mention, arpeggiated runs would be icing on the cake. Of course, that's the way I would do it.

EDIT: This is a track I wrote with a simple Saw wave bass, but the pitch bends and other stuff lend itself well to the bass style. https://soundcloud.com/lockheedmartian/pon-pon-won

He is talking about the fact that the clear plactic frame CANNOT be put in place properly without a tiny piece being chopped out. I'll upload a pic of mine for reference.

EDIT: as you can see, there is a crack in the bottom of the frame, dead center. I spread these and the little screw "arms" to get around the bottom right corner of the screen and its respective ribbon cable.