Just as a quick reminder, SORremake is a doujin game.
Well, bombergames (the creater/publisher) was ordered by SEGA to take down the game from their website, and to stop the distribution.
The game itself is not available anymore on the official website (the game lives by numerous links posted by fans around the web).
It's the project as a whole i guess, bombergames never gave much informations about that. So i am not sure about the music.
I posted the link to
the official v5 soundtrack on my post above.
This 4disc set was just a later compilation of all their work (it does include many music that did not make it into the game, that's why i don't consider that entry as the soundtrack related to the game), just to please fans.