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Resonance Frequency

2-pole          4-pole     

Xerograph

lowpass filter

In

Out

IE

The Xerograph is a foot-sweepable, resonant 
lowpass filter.  It can be used for a variety of 
sounds, from resonant synth sweeps, to fast funk 
sounds, to deep reggae/dub tones.

-

2-pole/4-pole switch:

 

-2-pole mode is a brighter, more  

 

subtle filter with a wide   

 

 

resonance peak.

 

-4-pole mode offers a fat, deep, and  

 

synthy filter with a sharp resonance  

 

peak.

-Frequency knob: 

 

When using the filter without an expres-

sion pedal, this control sets the cutoff frequency 
of the filter, allowing you to dial in deep, dubby 
bass sounds. When using an expression pedal 
with the Xerograph, the Frequency knob sets the 
low extent of the filter sweep.

Resonance knob:

 

 

Boosts frequencies around the cutoff 

frequency, which intensifies the effect of the 
filter. Set the resonance low for more subtle 
tone-shaping, or turn it up to around 3-o’clock 
for wet synth sound. Turning it to maximum 
sends the filter into self-oscillation.

Volume knob:

The Volume knob allows for the effect volume to 
be either louder or quieter than the bypassed 
signal, and to correct for volume loss that may 
happen as a result of heavy filtering.

Volume

Front view of the Xerograph 
in standard configuration

Frequency expression jack:

 

 

Connecting a passive expression 

pedal to the expression jack allows you to 
control the frequency of the filter with your 
feet, allowing for slow, resonant sweeps, or 
fast, funky squelches.

Recommended expression pedals:
Moog EP-2 
Iron Ether modded EBJR volume pedal

Note: standard Xerographs DO NOT accept 
control voltages (CV) into the expression 
jack. Contact us if you require voltage 
control. Never plug a control voltage into the 
Xerograph’s expression jack. At best, it won’t 
work. At worst, it will kill your Xerograph.

Power jack:

Runs on industry-standard 9 volt DC center 
negative power supply. Does not accept 
batteries.

9v DC Expression

Rear view of the Xerograph

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