MXR M-151 Doubleshot Distortion

Used MXR Doubleshot distortion pedal with original 18v power supply and box. Pedal works and sounds great. All knobs work but there seems to be a problem with the Mid EQ knob on the top channel and it is only when the Focus switch is engaged. The knob works when the Focus switch is disengaged and I personally think the channels sound better with the focus switch disengaged as it adds too much compression, especially if you already have a comp pedal up front. This is why the pedal is priced so low. Used by one of the guitarists from Quiet Company. This pedal can create a wide range of distortions.