Again, the n64 never had a dedicated music chip so all types of audio were produced at run time, of course the information exists some where but it seems likely that the location is different for every game and you would be better off recording them in an emulator, with an audio plugin which can dump the audio stream to wav or similar. There was a thread about this earlier, search for it... Read it, and realize why you aren't easily going to be able to retrive audio from roms by decompiling them...