Synth Pedals

A synth pedal takes the signal from your guitar or bass and turns it into something a keyboard synthesizer might make: a fat monophonic lead, a swirling organ, a squelchy filter sweep, or a glitchy cloud of sound. Some do it by pitch-tracking your notes and driving internal oscillator voices, some by mangling the signal itself, and some by sampling what you play and rebuilding it from scratch. The Hologram Electronics Infinite Jets is described by its maker as "a multi-voice synth pedal that resynthesizes individual notes/chords into new sounds using two independent sampling channels"¹. Older and simpler designs, like the DigiTech Synth Wah, lean on filters: RockBoard's entry for it lists "7 different synth effects including envelope filters, synth tones, filter sweeps, and more"².

What unites the category is that the pedal is doing something more radical than overdrive or delay. A fuzz changes your tone; a synth pedal replaces it. That makes these pedals some of the most expressive and some of the pickiest on a board, because how well one tracks your playing decides whether it sings or stutters.

What a synth pedal is

A synth pedal is a stompbox whose output is a synthesized sound rather than a processed version of your original tone. The family is broad. At one end sit pedals that generate classic synth voices, like the Boss SY-1, which packs a synth engine into a standard compact box and includes a Hold function: "Pressing and holding the pedal switch sustains the last-played synth sound, allowing you to jam with regular guitar over" it⁶. At the other end sit pedals that barely sound like synths at all in the keyboard sense, like bitcrushers, which deliberately degrade your signal into lo-fi grit.

Some makers lean into the strangeness. Godlyke's page for the Dytone Guitar Synth, a distortion pedal with synth behavior, describes it plainly: "The Guitar Synth is a great and crazy effect pedal. This box is nothing you have heared before. The Guitar Syth makes a crazy wild sound"⁷. That kind of character is the point for many players: a synth pedal is usually bought for a specific sound, not as a general-purpose upgrade.

The category also overlaps with keyboard and drum gear. Some pedals in this family are designed to sit alongside synths in a rig as much as in front of an amp, accepting line-level as well as guitar-level signals, and some players use them to process keyboards, drum machines or vocals. If you already use a synth, a pedal that accepts line level can serve both instruments.

How synth pedals work

There are three main approaches, and knowing which one a pedal uses tells you a lot about how it will behave.

Pitch tracking into oscillator voices. The pedal analyzes the pitch of your note and drives its own oscillators at that pitch. This is how the classic monophonic synth pedal works, and it is why chords are a problem: the tracker hears several notes at once and cannot decide which to follow. Subdecay's Brian Marshall is direct about this in the company's buying guide: "All of our synth pedals are monophonic"³. The trade-off is that a monophonic pedal usually gives you the strongest, most synth-like voice, because the pedal is generating the sound rather than filtering yours.

Signal mangling. Instead of tracking pitch, the pedal reshapes the signal itself: multiplying it into octaves and harmonies, ring-modulating it, or crushing its digital resolution. EarthQuaker Devices notes that pitch-shifting pedals "can be used as octave pedals but are more versatile because you can add harmonies, and many are polyphonic"⁸. Ring modulators and PLL (phase-locked loop) circuits fall in this group too, producing metallic or aggressive tones from the raw signal.

Sampling and resynthesis. The pedal records what you play and rebuilds it. The Infinite Jets does this with two independent sampling channels, resynthesizing notes or chords into new sounds¹. Granular pedals take this further, chopping the sound into tiny grains and rearranging them. MXR describes its Textures Granular Synth Engine in exactly these terms: it "pulls your sound apart and weaves it into wondrous new forms"⁹.

A useful comparison is the humble chorus pedal. As Joki Schaller explains on the Lehle blog, a chorus "doubles the signal, but delays the copy for a few milliseconds, pitches it up and down a few cents and merges them back together"¹⁰. A synth pedal takes that same idea of copying and re-pitching your signal and pushes it much further, from a subtle shimmer to a completely new voice.

History and landmark synth pedals

Guitar players have wanted synthesizer sounds since the 1970s. Early dedicated systems included the Roland GR-300 and the EMS Synthi Hi-Fli, units that treated the guitar as a controller for a separate synth engine. The stompbox approach came later, and the category has kept evolving in the last few years.

A few recent releases show the range:

Styles: guitar synths, pitch-multiplier synths, bitcrushers and granular pedals

Guitar synth pedals

Pitch-multiplier synths

These pedals multiply your signal into octaves, fifths and harmonies rather than replacing it. EarthQuaker Devices groups them with octave pedals but notes they are more versatile because you can add harmonies, and many are polyphonic⁸. Examples include the Pigtronix Mothership2, the Pigtronix Space Rip, and the Eventide HotSawz, which stacks sawtooth voices on your playing. Because they work from your own signal, they tend to track better and handle chords more gracefully than oscillator-based designs.

Bitcrushers

Granular pedals

What the usual controls do

Synth pedals vary widely in layout, but a few control schemes recur.

The JHS 3 Series Bitcrusher is a good example of the simple end: "three simple controls and one toggle that offer a wide range of sounds, perfect for beginners and professionals"¹¹. At the other end, granular pedals like the MXR Textures carry mode switches, preset selectors and secondary parameter layers⁹, and the Electro-Harmonix Atomic Cluster spreads its functions across Atoms, Speed, Mode, Volume and Blend knobs¹².

The Hold function on the Boss SY-1 is worth knowing about as a category feature: press and hold the switch and the last synth note sustains while you play regular guitar over it⁶. Reviewers of the FruitFX Melon Cube praised its Gate, Shape, Juice and Tone controls, which shape the pulse-width modulation at the heart of that pedal¹³. On fuzz-adjacent designs, the control set looks more like a drive pedal: Wilson Effects describes its Lusus Naturae as having "four standard controls, output, tone, gain and clipping"¹⁴.

Signal chain placement and power

Where in the chain

Boss's effects-order guide gives a chain that works well for synth pedals: tuner first, then pitch-based effects, then compression, then wah and filter effects, then drive, then modulation, with amp and cabinet simulators at the end feeding a PA, interface or headphones⁴. The logic for putting a synth pedal early is simple: it wants the cleanest, strongest version of your signal to track, before drive pedals add harmonics that confuse the tracker.

The same principle applies to filter-style pedals. The GuitarPCB SWAH V4 manual insists that "Pedal Placement is critical just as it is with a Standard Wah pedal and should be placed closest to your Guitar in the effects chain"¹⁵. A synth pedal with a strong filter character behaves the same way.

Power

Most synth pedals are digital, and digital pedals are the ones that cause trouble on shared power. Truetone notes that "analog pedals and single-effect digital pedals work together quietly on a daisy-chain, but digital multi-effects and modelers" cause noise when sharing power⁵. Voodoo Lab explains why: daisy chains "force every pedal in your rig to share a single electrical path. That means they share the same ground and" the same noise floor¹⁶. A granular pedal or a multi-voice synth engine is exactly the kind of hungry digital circuit you want on its own isolated output.

Questions to ask when choosing a synth pedal

Other questions worth asking:

Sine Effect describes designing pedals "using both my own experience as a musician and input from hundreds of artists who have" tried them over the years¹⁷. Maker pedigree and artist feedback are worth weighing, but the deciding factor is always whether the pedal makes the one sound you are chasing.

Questions