I let my husband take care of that. HE was trying to explain how he does it, and it started giving me a headache, so I let him do his thing. He played progressively more difficult songs on expert to test the audio, and he finally came up with a number he says works for him. I will go with that.
He's also a drummer, but I am not sure the drum set works well enough to calibrate with it ( he's a little hard on it )
Thanks for all the info