HIGHS: Adjusts the level of the treble shelving filter. This control is configured to add (or subtract) just enough treble to sound usable in every position.
LEVEL: Does what you expect!

LOWS: Adjusts the level of the bass shelving filter. Like the Highs control, this adds or subtracts bass in a tasteful manner. Cranking both knobs creates a ~-5dB mids scoop. Rolling both back achieves the opposite effect.
SUSTAIN: Lets more of the first stage into the core distortion engine, you can think of this control as “Fuzz” even though the originals shied away from explicitly saying that. This knob is equipped with a treble retaining subcircuit to keep the highs present when rolling it down, the lack of which is a major reason why many older pedals of this type sound strange when doing so.
The Manx Loaghtan accepts anything between 9V and 18V with a center-negative DC power supply (though we recommend 9V). Plugging in anything other than this (center-positive, AC, higher voltage, etc.) there’s a good chance that you will put your Manx out to pasture. Save yourself some time and headache and plug the correct adapter into the pedal the first time, otherwise you run the risk of voiding your warranty, and a fuzz with no fuzz is a paperweight.