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Its a resistor ladder. i.e. Each button has a different resistance value.
I hooked up my Infill G4. The diagnostic tool shows that each button press is unique but the unit doesn't quite work. I'm sure its the software support for the Infill.
Hey, who needs volume down and mute anyway! My head unit is obviously telling me to PLAY IT LOUD!!!
(All buttons work except MUTE is BACK and VOL DN is VOL UP).
Good Luck.
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