EVH 5150 Iconic 15

Presence control:

Reverse audio taper which comes up faster. Other 5150 amps the presence control does nothing until about 5.

Red channel:

The gain was reduced compared to the 5153 (somewhere between the blue and red) to allow the burn switch to be a bigger gain boost.

the red channel has a built-in automatic noise gate that increases with the gain knob.

Green channel:

The Overdrive button on the green channel is intended to match the 5153 blue channel. This means that this is essentially 2 channels in one.