Pry at the bottom lip of each knob to lift them from their potentiometers. A spudger works best to prevent scratching, but a small flathead screwdriver can be used as well.

Once lifted, the knobs will be loose enough to pull off by hand.

The position of each knob does not matter, as they can only fit in one orientation.

Do not use pliers, as the plastic is very soft and will be damaged.