Latest specs for the MSU-1?

Hi, where can I find the latest specs for the MSU-1? I mean the internal description. I could only find the link below:

https://helmet.kafuka.org/msu1.htm

But this specification is the old one. Seems that there is newer versions that added some new features, like Pause. I'd like to know the register changes for these newer versions.

Thanks...

Pause is simply stz $2007.

The only feature I know not listed there is $2007-04 which saves the current track point, so you can play another theme in the meanwhile and resume the former track. I used this e.g. in star ocean where e.g. the overworld theme is interrupted by battle. So I was able to resume the overworld instead restart.

Qwertymodo (discord) can surely tell you more, however I think I asked him and think he doesn't know other new features than this $2007-04. But can't tell for sure. Also there's a bsnes channel you can get technical details

https://discord.gg/zPQWKyg6Xs

Thanks, I already got the information.