CarPC JoyCon EX enables you to load the Centrafuse function(Media, Radio, Navigation, Phone….) with Steering wheel remote controls.

Assign the “Preset Up/Down Button” and connect the hotkey for loading the function to that “Preset Button”.
(In the picture below, “Ctrl + D + 1” is “Load Meda”.)
Preset Up/Down Button must have same hotkey.

When you press the Preset Button, Preset and Centrafuse function is changed at the same time.

Example Preset

https://www.exinterface.com/d/dn/cpjex/Cpjex_Centrafuse.zip