9 Best Synthesizer Pedals for Guitar

Guitar synth pedals let you generate keyboard-style sounds — fat analog pads, searing leads, shimmering arpeggios — directly from your guitar signal. No hex pickup, no MIDI cable, no keyboard skills required. You just plug in and play.

The category has exploded in recent years. Boss, Electro-Harmonix, Meris, and Source Audio all make dedicated synth stompboxes that track polyphonically and respond to your playing dynamics. Whether you want subtle texture underneath clean arpeggios or full-blown Moog-style leads, there is a pedal built for it.

Here are nine of the best guitar synthesizer pedals available right now.

What Is a Guitar Synth Pedal?

A guitar synthesizer pedal detects the pitch of your guitar signal and uses it to trigger an internal oscillator. Unlike effects that modify your existing tone — chorus, delay, reverb — a synth pedal generates entirely new sound. The oscillator produces waveforms (sine, saw, square, triangle) that the pedal then shapes with filters, envelopes, and modulation, just like a standalone keyboard synth.

Most modern guitar synth pedals track polyphonically, meaning they can handle full chords without glitching. Older designs and some budget models only track monophonically, so you are limited to single-note lines. The tracking quality — how quickly and accurately the pedal follows your playing — is the single biggest factor separating a great synth pedal from a frustrating one.

Best Guitar Synth Pedals

1. Boss SY-1 Guitar Synthesizer

The Boss SY-1 is the easiest entry point into guitar synthesis. It packs 121 sounds across 11 categories — lead, pad, strings, bass, bell, organ, and more — into a standard Boss compact enclosure. No menus, no preset banks to manage. You pick a type with one knob, choose a variation with another, and adjust the tone and depth.

Tracking is polyphonic and practically instantaneous thanks to Boss’s proprietary DSP engine. It works with any standard guitar pickup, so there is no need for a special hex pickup or GK connector. The SY-1 also handles bass guitar, which makes it useful across multiple instruments.

Where it falls short is deep editability. You cannot tweak the filter cutoff, envelope shape, or oscillator blend on a per-preset basis. What you hear from the knobs is what you get. For players who want a synth pedal they can dial in quickly without reading a manual, that limitation is actually a strength.

Best for: Players who want instant synth sounds with zero learning curve.

2. Boss SY-200 Synthesizer

The Boss SY-200 is the step up from the SY-1 for players who need preset storage and deeper control. It offers 171 synth sounds spread across 12 categories, with adjustable parameters for each. A small LCD screen keeps you oriented, and you can save and recall 128 user presets.

The dual-footswitch layout lets you toggle between presets on the fly or use one switch to momentarily engage the effect, which is great for live use. It also accepts an expression pedal for real-time filter sweeps and other parameter changes.

Compared to the SY-1, you get noticeably more control over each sound. You can shape the envelope, adjust the filter, and blend dry and wet signals with more precision. The tradeoff is that it takes longer to set up. If you gig with specific synth tones and need to recall them reliably, the SY-200 justifies its size.

Best for: Gigging guitarists who need reliable preset recall and expression pedal control.

3. Electro-Harmonix Mono Synth

The EHX Mono Synth delivers 11 distinct synth voices that lean toward vintage analog character. Think classic Moog-style leads, thick sub-bass, and warbling filter sweeps. Each voice responds to four knobs for quick adjustment, and the dry/wet blend lets you layer the synth sound underneath your clean guitar tone.

As the name suggests, it tracks monophonically only. Play single notes and it responds beautifully with smooth, musical tracking. Strum a chord and it will pick up the loudest note and ignore the rest. For lead lines and bass-register riffs, this is not a problem. For pad-style chord work, look elsewhere.

The Mono Synth runs on a standard 9V supply and fits on most pedalboards without issue. It is one of the most affordable dedicated synth pedals on the market, and the analog-inspired voicing gives it a warmth that some digital synth pedals lack.

Best for: Players after vintage analog synth tones on single-note lines.

4. Electro-Harmonix Micro Synthesizer

The EHX Micro Synthesizer is a legendary pedal that has been in production since the late 1970s. It uses ten slider controls to blend four voices — guitar, sub octave, octave up, and square wave — through a resonant filter with adjustable attack delay and rate. The result is thick, aggressive synth tones that sit somewhere between a fuzz and a keyboard synth.

This is not a preset-based pedal. The ten sliders are always active, and dialing in a sound means physically moving them. That hands-on approach gives you a direct, tactile connection to the tone that knob-per-function designs cannot match. It tracks monophonically and works best with a clean signal at the input.

The Micro Synthesizer has been used by everyone from the Beastie Boys to Radiohead. It excels at fat, squelchy lead tones and octave-fuzz textures. If your reference point for synth guitar is classic alternative and experimental rock rather than modern electronic music, this is the pedal to start with.

Best for: Guitarists who want hands-on, slider-based tone sculpting with a vintage pedigree.

5. Source Audio C4 Synth

The Source Audio C4 is a deep-dive synth pedal disguised as a simple four-knob stompbox. On the surface, it offers two onboard presets that you toggle between with the footswitch. Underneath, the Neuro app unlocks a full-blown modular synth engine where you can configure dual oscillators, filters, envelopes, LFOs, and effects chains.

This is the pedal for sound designers. The Neuro app lets you build patches from scratch using a visual signal-flow editor, then push them to the pedal. The community library has thousands of user-created presets covering everything from analog polysynth pads to glitchy bitcrushed textures. If you can imagine a synth sound, you can probably build it on the C4.

Tracking is polyphonic and solid. The four physical knobs can be mapped to any parameter you choose per preset, so you always have hands-on control of whatever matters most. It is also compatible with MIDI for external control.

Best for: Sound designers and experimenters who want near-unlimited synth customization.

6. Meris Enzo Multi-Voice Synthesizer

The Meris Enzo turns your guitar into a legitimate polyphonic synthesizer with mono, poly, arpeggiator, and dry-through modes. Each mode offers deep control over the oscillator, filter, envelope, and sustain parameters. The arpeggiator alone is worth the price of entry — it can generate cascading sequences from single notes or chords.

The Enzo uses an analog-style filter that gives its tones a musical warmth you do not always get from digital synth pedals. Alt-hold functions on every knob double the available parameters, and full MIDI implementation means you can integrate it into a larger rig with tempo sync and external preset changes.

The learning curve is steeper than a Boss SY-1, but the payoff is massive. Once you learn its layout, the Enzo can produce everything from ambient drones to aggressive lead synths to rhythmic arpeggio patterns. It works in stereo, too.

Best for: Players who want a serious polyphonic synth engine with arpeggiator and deep parameter control.

7. Boss GM-800 Guitar Synthesizer

The Boss GM-800 is a floor-based synth workstation built around the same sound engines found in Roland’s flagship Jupiter-X and Fantom keyboards. It offers over 1,200 tones and 70 rhythm patterns, with detailed editing for every parameter. This is not a stompbox — it is a full synthesizer that happens to accept a guitar input.

The GM-800 tracks via a standard guitar pickup (no hex pickup required), and polyphonic tracking is fast and accurate. A large, clear LCD and dedicated knobs for each parameter section make the interface manageable despite the depth. You can layer multiple tones, split voices across string groups, and access additional sound packs from Roland Cloud.

Where the GM-800 really shines is in studio work and performances where you need the guitar to convincingly replace a keyboard. The sound quality is in a different league from compact synth pedals. The size and complexity mean it is overkill for someone who just wants a pad sound for one song, but for players building a rig around guitar synthesis, nothing else comes close.

Best for: Serious synth guitarists who want workstation-level sound design from a floor unit.

8. Gamechanger Audio Motor Synth Pedal

The Gamechanger Audio Motor Synth takes a radically different approach. Instead of digital oscillators, it uses electro-mechanical motors to generate its sound, creating tones that have a physical, organic quality unlike any other synth pedal. Modes include raw motor oscillation, granular textures, portamento glide, and cross-modulation between the motors.

It tracks your guitar pitch and uses that information to drive the motors, but the result sounds nothing like a standard synth preset. The tones range from gritty, industrial drones to ethereal, wobbling textures. An interval selector lets you set the motors to harmonize at octaves, fourths, or fifths relative to your played note.

This pedal is for experimental players who want sounds that cannot come from any other source. It is not going to replace a Boss SY-1 for bread-and-butter pad and lead tones. But for ambient, noise, soundtrack, and avant-garde work, the Motor Synth is genuinely unique.

Best for: Experimental and ambient guitarists looking for truly unconventional synth textures.

9. Roland GR-55 Guitar Synthesizer

The Roland GR-55 remains a relevant option for players who want the deepest possible guitar synthesis experience. It requires a hex pickup (like the Roland GK-3) mounted on your guitar, which gives it individual string tracking that no standard-pickup synth pedal can match.

With that hex pickup, the GR-55 can assign different sounds to different strings, blend synthesizer voices with modeled guitar amp tones, and apply pitch-to-MIDI conversion with near-zero latency. It includes PCM synth tones derived from Roland’s legacy sound libraries, plus COSM guitar modeling for amp and effect sounds.

The GR-55 demands commitment — you need the hex pickup, a 13-pin cable, and time to learn the deep editing interface. But for players who regularly need piano, organ, strings, brass, and synth pads alongside their guitar tone in the same performance, it remains one of the most capable options available.

Best for: Multi-instrumentalist guitarists who need the deepest possible sound palette and are willing to install a hex pickup.

How to Choose a Guitar Synth Pedal

Tracking: Polyphonic vs. Monophonic

Polyphonic synth pedals track full chords. Monophonic pedals only follow single notes. If you plan to play pad sounds under chord progressions, you need polyphonic tracking. If you mainly want synth leads and bass lines, monophonic tracking is fine and often sounds tighter on single-note passages.

Ease of Use vs. Depth

There is a clear spectrum here. The Boss SY-1 is grab-and-go — every sound is accessible within seconds. The Source Audio C4 and Meris Enzo require hours of exploration to fully exploit. Neither approach is better; it depends on whether you want a tool or a creative playground.

If you are building a pedalboard with a preamp and a handful of essentials, the SY-1 or EHX Mono Synth slots in without friction. If you are the type who programs patches in an editor app, the C4 will reward your time.

Signal Chain Placement

Synth pedals need the cleanest possible input signal to track accurately. Place them early in your signal chain, before overdrive, distortion, delay, and reverb. If you run a compressor, that can go before the synth pedal — a slightly compressed signal can actually improve tracking consistency.

If you also run chorus or EQ pedals, those should typically come after the synth in the chain so they shape the synth output rather than confusing the pitch detection input.

Compatibility and Integration

Most modern guitar synth pedals work with any magnetic pickup. The exceptions are the Roland GR-55 and Boss GM-800’s GK input mode, which benefit from or require a hex pickup. MIDI capability matters if you want to sync arpeggiator tempos with a drum machine, controller, or DAW. The Meris Enzo, Source Audio C4, Boss SY-200, and GM-800 all support MIDI.

Expression pedal inputs are worth looking for if you want real-time control over filter sweeps or volume swells during performance. The Boss SY-200 and Meris Enzo both accept expression pedals.

Hardware Synth Pedals vs. Software Plugins

Software synth plugins can replicate almost any sound a hardware pedal produces, often with more editing power and lower cost. So why buy a pedal?

The answer comes down to workflow and feel. A hardware synth pedal responds in real time to your playing dynamics — pick attack, string bends, vibrato — in a way that feels immediate and connected. Software requires an audio interface, a computer, and a plugin chain, which adds latency and complexity that interrupts the playing experience.

Hardware also adds subtle character. Even within digital synth pedals, the analog-to-digital conversion, the filter circuits, and the output stage color the sound in ways that are difficult to replicate in software. For live performance, a pedal is vastly more reliable and portable than a laptop rig.

That said, if you are producing music in a DAW and need a specific synth tone for one track, a plugin is often the more practical choice. Many players use both — hardware for live playing and writing, software for production and mixing.

Final Thoughts

The guitar synth pedal market has matured significantly. You no longer need to choose between tracking quality and sound selection. Even entry-level pedals like the Boss SY-1 deliver polyphonic tracking that would have been considered impossible a decade ago.

For most players, the Boss SY-1 or SY-200 is the right starting point — solid tracking, a wide range of usable sounds, and straightforward operation. If you want deeper sound design, the Source Audio C4 and Meris Enzo open up near-limitless territory. And if you need professional-grade synth tones for studio work, the Boss GM-800 sits at the top.

Start with the pedal that matches your current needs, not the one with the longest spec sheet. A synth pedal you actually use on every gig or recording session is worth more than one that sits on your board because you felt you should own it.