Electro-Harmonix SYNTH9 Synthesizer Machine Pedal

Transform your guitar or bass into nine different sought-after vintage synthsizers, from saw-like lead synths to more subtle, spacey, atmospheric pads.

The polyphonic Electro-Harmonix SYNTH9 Synthesizer Machine Pedal transforms your guitar or bass with 9 presets that were precisely tuned to emulate the most sought after, vintage synthesizer sounds ever! From searing lead synths to spacey synth pads and deep, funky, synth bass grooves, it's all accessible.

The SYNTH9 is also super easy to use with DRY volume, SYNTH volume, CTRL1 and CTRL2 knobs that provide precise control over each preset's parameters.
If you dig the kind of classic synth sounds made famous on recordings by groups like ELP, EVH, Kraftwerk, Joy Division, P-Funk, Peter Gabriel and more, we think you'll love the SYNTH9.

Learn more and see the EHX SYNTH9 in action:

EHX Tips for the SYNTH9

- The SYNTH9 is generally best used as the first pedal in an effects chain. Place modulation, delay, and reverb effects after the SYNTH9. The unit will not perform well if placed in the effects loop of a guitar amp.
- For optimal playability, set the guitar's pickup selector to the bridge pickup and turn the volume knob all the way up ("10").
- Avoid placing a distortion or overdrive in front of the SYNTH9, which could muddy up the input signal and cause the tracking to be unstable. If you want to add overdrive or distortion, place it after the SYNTH9.
- The SYNTH9 has a built in compressor that is active on the synth sounds at all times. We recommend you do not insert another compressor into your signal chain while the SYNTH9 is in effect mode.


- Transforms read more the tone of your guitar or bass into that of a vintage synthesizer
- 9 presets that were created to emulate many of the most popular synthesizer sounds ever
- Works on guitar or bass without modifications, special pickups or MIDI implementation
- The SYNTH9's usable tracking range extends up to about the 23rd fret on the high-E string of a standard guitar and down to the open A-string on a bass guitar
- Use the SYNTH9 with a B9 or C9 Organ Machine as well as the KEY9 Electric Piano Machine and MEL9 Tape Replay Machine to create your own mega-keyboard setup
- EHX 9.6DC-200 PSU included
WARNING: Cancer and Reproductive Harm - www.p65Warnings.ca.gov.
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- Dimensions in inches: 2.75 (w) x 4.5 (l) x 2.1 (h)
- Dimensions in mm: 70 (w) x 115 (l) x 54 (h)
Dimensions and Weight in Packaging
Base Item
Shipping Weight: 1.5 lbs
Shipping Dimensions: 7 x 6 x 3 in
Manufacturer Part Number (MPN): SYNTH9

For support or warranty questions, please contact the manufacturer:
Phone: 718-937-8300

Reviewers gave this product an overall rating of 4.5 out of 5 stars. (4 ratings)
Submitted April 5, 2017 by Dan Kennedy in San Jacinto, CA

"One of the coolest stomp boxes EVER!"

Overall: 4.5 out of 5 stars
(see rating details)
Verified Customer zZounds has verified that this reviewer made a purchase from us.
It arrived today from zZounds, and I plugged it in and played through it for a couple of hours, and it totally blew my mind. Then I went and took a nap, got up and played through it, and it totally blew my mind all over again. The potential of it is almost unimaginable! Not only can you get most of the great synthesizer sounds of the '80s, but by using the dry volume knob, you can crank up your guitar sound, and use the synth volume to bleed in the effect, leaving it more in the background, and by doing so you can create a plethora of sounds previously in-obtainable in any effect box ever! This thing sparks the imagination as much as going out on your first date! A lot of times products don't live up to the hype of what they are advertised to be. It's just the opposite in this case. It's so much more than what the advertisements make it out to be! Electro Harmonix has always been an innovator for as long as I can remember, but they knocked it clean out of the park with this baby! It not only turns your guitar into a synthesizer, but it doubles as one of the coolest guitar effects pedals ever!

Musical Background:

I play guitar, drums, harmonica, bass, ukulele and sing. I've done them all professionally, most of them since the '60s.

Musical Style:

I'm deeply rooted in the Blues, and Classic Rock, but have also worked in Country bands, as well as Jazz groups and have been a
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