Keeley Electronics Synth 1 – Reverse Attack Fuzz Wave Generator


A guitar-triggered, single-note wave generator for single-note synth fuzz; reverse attack and swell bandpass filter control.

From unnatural fuzz noises to pseudo-harmonic, random glitchy counterpoint, the Keeley Synth-1

Requires 9V DC centre negative power supply. Draws approx. 70 mA

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Keeley Electronics Synth 1

The Keeley Electronics Synth-1 is a guitar-triggered, single-note wave generator.

Synth-1 allows you to create fuzzed-out synth waves!

Use the Filter and Blend controls to mix your guitar with the fuzz from the synth.  Go from churning slow-gear reverse swells to sounding like a light saber.

You control the tone of the wave with the Filter Control.

The lead-in time or swell of the note is controlled with the Attack knob.  Then use the Blend control to remove the natural tone from your guitar as you slide through synth-sounding fuzz waves.  Use an expression pedal to control the Filter, and now you have Wah-Wah-like control of the Synth-1.

This is what it sounds like.

  • Synth Wave Generator – Create fuzzed-out, single-note synth sounds
  • Reverse Attack – Volume Swell Effect – put your guitar in slow gear!
  • Chaos Switch – change dimensional triggering and octaves and stuff
  • Filter – shape the EQ and tone of your fuzz wave
  • Wave Selector – change wave modes on the fly with your foot!
  • Control the Blend of your natural guitar and the wave generator
  • Side Mount Expression Jack for TRS control of the Filter
  • Top Mounted Jacks, True-Bypass



Controls the overall level of the synth


Volume swell effect ranging from 1500ms to 4ms. This effects both the dry signal and the synth signal


Left for dry signal, right for synth wave signal.


Turns both the swell and synth on and off.


Controls the cut-off frequency of the synth waves, sweep is the same on all modes, ranging from 5ohz to 5ooohz.

Chaos switch

The chaos switch changes the type of detection used.

In the “normal” mode positive and negative peak detectors are compared to the input signal to obtain the period, this is the same type of detection used in the boss oc2 and is much more stable and consistent.

In chaos mode, zero cross-detection is used on the saw and square to obtain the pitch. This mode is only looking for a change on the input signal.

It has a harder time determining the fundamentals from harmonics causing it to be more unstable.

The chaos sine mode uses a standard octave down with another octave slightly out of tune to cause flanging type modulation.

The time signal is then hard-clipped to achieve distortion.

Peak light

Indicates the passing of signal through the filter section of the synth 1

Power supply 9V DC centre negative. Draws approx 70 mA

Additional information

Weight 0.35 kg
Dimensions 12 × 9.5 × 5.0 cm
Analogue or Digital



Black, Silver


70 mA



Pedal Type


Power Connection Type

Centre Negative

Silicon or Germanium




EAN 13





Synth 1


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