Function of the KDC-X569/KDC-X469Toggles ON or OFF the mute control on the built-in amplifier.Turning ON this control enhances the preout quality.Display Setting"AMP Mute Off" The built-in amplifier activates."AMP Mute On" The built-in amplifier deactivates.Built-in Amp Mute Setting Function of the KDC-MP522/MPV622/MPV6022/422/4022Switching the preout between the rear and non-fading. (In non-fading it outputs without effect from the fader control.)Display Setting"SWPRE Rear" Rear preout."SWPRE N-Fad" Non-fading preout.Switching preout Function of the KDC-X569/KDC-X469Setting display/don't display for the System Q factors (Basscenter frequency, Bass Q factor, Bass extend, Middle centerfrequency, Middle Q factor, and Treble center frequency) inAudio control.Display Setting"System Q ON" The System Q factors are displayed."System Q OFF" The System Q factors aren't displayed.System Q SettingFunction of the KDC-X569/MP522/MPV622/MPV6022/X469/422/4022Dimming this unit's display automatically when the vehicle lightswitch is turned ON.Display Setting"Dimmer ON" The display dims."Dimmer OFF" The display doesn't dim.DimmerAdjusting the display contrast.Display and Setting"Contrast 0"/ "CONT 0""Contrast 5"/ "CONT 5" (Original setting)"Contrast 10"/ "CONT 7"… …Contrast Adjustment— 25 —