Currently, the 507 defaults to Prologic w/ 7 speakers for tuner. I want to change the default to something else without using a computer. It appears that I am not saving the config after I change it. Where is the SAVE button or how is this done? Does anyone have some more extensive information on how to work this thing. The manual is quite limited. It does not even mention how to do FM presets. Seems like there should be a tech document floating around. Thanks.