I don't get a 4 channel equalizer, but the fader works.

You have to switch it from 2-channel mode to 4-channel mode yourself. The ability to switch it into 4-channel mode is only available when it's in car. You need to specifically go down to that menu option in the equalizer and change it. After you've done that, the other 4-channel options become available to you.

Once you've set it up for 4-channel use and saved that as a permanent equalizer preset, then it will come up in 4-channel mode in the car after that. But by default, it's in 2-channel mode and you have to select it yourself.

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Tony Fabris