Why is the Low Cut knob not very responsive?
The low cut on the Lion is unlike traditional low cut knobs where they remove lows from the signal path post distortion. The Lion has the low cut positioned in the feedback loop of the opamp, which acts like the "sag" on tube amplifiers. With the low cut knob turned counter clockwise you will notice a more "spongy" feel to the distortion which can more compressed. With the low cut knob turned clockwise you will notice more "tightness" to the feel of the the distortion which can be less compressed.