How do i add music to the game

Posted in Support
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i couldnt find any method
i have a wav file i can convert it to rsd but how do i get it into the game?

i want to put a replace the sunday drive rsd with a music file which is rsd but keep getting invalid signature
It's not as simple as that, some hex editing is required. There's some older threads I can't seem to find with instructions.
Heres a video showing how to do it.