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Hex Fuzz Output Expander

Add EQ, Volume, and Wet/Dry controls to Hex Fuzz or other polyphonic effects modules


The Hex Fuzz Output Expander module is an important add-on for the Hex Fuzz Amplifier, creating a large variety of tones with complete control over the mix of sounds for each of the individual channels.

The module features passive tone control circuitry that consists of low-pass and high-pass filters with cross-fade control, much like the classic fuzz pedals.


The Tone controls determine the relative amounts of each filter type.  On the rear of the module one can select two different values for each resistor and capacitor in the each of the two filter types, resulting in 16 different possible response curves for each channel.

The tone circuit outputs are fed into an active buffer with variable gain of 0.1 - 2x via the channel Volume controls.

The six EQ’d and volume-adjusted fuzz signals are each cross-faded with the clean guitar input (obtained from the Hex Fuzz Amplifier Input Thru connector) for the desired wet/dry balance.

Ideal for guitar or bass single-string processing.

Made in the USA.


  • 16 different tone curves for each channel, selectable through dip switches on rear of module

  • Fuzz output volume adjustment to match guitar signal levels

  • Clean guitar input

  • Wet/dry mix of fuzz and clean guitar

  • Not necessarily limited to Hex Fuzz - will work with any SynQuaNon polyphonic effects module

  • Ideal front-end mixer for Hex VCF or Hex VCA

  • SynQuaNon Bus audio input and output headers on the back of the module - no patch cables!

Technical Specifications:

Width     12 HP

Depth     36 mm

Power     23 mA @ +12V

                 23 mA @  -12V

                  0 mA @  +5V

Gain        -20dB to +6 dB for each channel

Reverse power protection, resettable fuses, extensive power supply filtering

View the v1.0 Manual

View on ModularGrid

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