Restores the ambience sound volume to its original value, best heard in the CCE beta.

No previews at the moment. Code is messy as it's mostly a direct lift from CCE.

Updated from previous version with a more recent version on my drive -- admittedly untested. Report an issue if it has one.

NOTES:.
Both Biker Heist D2 and Green Bridge are quite loud -- not unusually so, but some might find this disorienting.