This is something where you need good knowledge of assembly. Most games have routines that store values to the sound-related hardware registers. Thing is, each game is different, so you not only need to know where these routine calls are in the binary, but how they work. Unless you get a hold of the disassembly and change the form of the sound effects to be generated, you probably won't be able to do much in regards to how the sound is structured, just by hacking the binary.
There are three parameters to work with when dealing with sound: volume, frequency, and the noise type (IIRC). Different games do different things to put these parameters to use.
My knowledge about sounds on the VCS are pretty limited, so I hope my answer was correct.
well thanks for the help all i know is to look throught the AUDxx and find were it is located but thats all