Ok, thanks to Korama's excellent Sega PC Reloaded program, I've been able to install and play Sonic CD 1996 without any serious problems, except for the music.
I've ripped the music straight from the disc, but for some reason, the tracks are an odd order. I've tried to, by try and error, re-arrange them, but still, some tracks won't play at all, like the Act Clear or power up themes, even though I'm fairly certain those ones are correct.
I've tried looking online for help, but this game seems to be poorly documented. The best I can find is this, whilst looking for a way to hex edit the save or try and work out the PC track list, but it's dated from 2001, and tbh, not really helpful.
If anyone can help me out with this, I'd very much appreciate it. Thanks.