>>33610967
>What's this, never heard of it...
Long story short, it's a modified version of the Sonic CD decomp that adds Knuckles and Amy and tons of customization options - including enabling "Miracle forms" for getting all of the time stones, which is basically just Super + free time travel. You can freely change the soundtrack, there are some custom US past tracks if you use that soundtrack.
https://www.youtube.com/watch?v=zfi10FD70wc