Fix Oil Ocean Music Bug
From Sonic Retro
In Sonic 2 there is a bug which happens when you use the 14 continues cheat basically it only plays the oil ocean theme it was fixed in REV02 but it can easily be fixed.
These will be done with the SNV and GitHub disassembly
Find the label CheckCheats and find this line.
move.b #SndID_ContinueJingle&$7F,d0 ; Play the continue jingle
Remove the &$7F that's it.