the generator is used on the noise channel for crappy sounding effects. you know when you have the tv on channel 3 and it sounds like "ppsssss" that's what it does, it's sound with random amplitude. and thats what the generator is for, I've been using nnesster or something like that to test my emulators sound because it lets you turn on and off the individual sound channels. use that if you want to know if a game uses the noise channel, from what I see a lot do.