PettyJohn Predrive, User Manual

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Vari-Z:

Possibly the most subtle tone shaping function on 

the PreDrive, the Vari-Z switch adjusts the input 

impedance of the preamp. In the up position, 

the pedal is set to 1M ohm, which is the standard 

input impedance of an amplifier.  In the downward 

position, the input is dropped by half and replicates 

many classic stomp box overdrive pedals. In 

general, this will mostly effect the extreme highs 

of the tone. Each pickup will respond differently to 

changing this switch but in general, humbuckers like 

the higher impedance and single coils like the lower 

impedance setting, which can help tame some of 

the “zip” and “harshness” that some single coils 

have when played hard. 

Low Cut Knob:

Turn the Low Cut knob counter-clockwise to tighten 

the bass response of the signal.

High Cut Knob:

Turn counterclockwise to reduce the highs in the 

tone and reduce harsh tones.