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Description
pedals for synthesizers SYNTHOTRON IIIA glorious all analog monophonic guitar Synthesizer with Filter, Sample and Hold and Analog Chorus. The Synthotron is an incredibly unique pedal. The term "unique" seems to get overused a lot in the world of pedals.. but the Synthotron III does things to your guitar sound that no other pedal can do. From the sublime to the ridiculous. So many sounds. So many options. So much fun. SYNTHESIZER SECTION 4 independent all analog voices with pitch and
A glorious all analog monophonic guitar Synthesizer with Filter, Sample and Hold and Analog Chorus.
The Synthotron is an incredibly unique pedal.
The term "unique" seems to get overused a lot in the world of pedals..... but the Synthotron III does things to your guitar sound that no other pedal can do.
From the sublime to the ridiculous. So many sounds. So many options. So much fun.
SYNTHESIZER SECTION
- 4 independent all analog voices with pitch and octave settings across them, determined by the top toggle switch on each of the four channels.
- Voice One toggle - Pitch 1 -(Yellow strip)= Unison, 1 octave up, 2 octaves up
- Voice Two Toggle - 8ve - (Orange strip) = References whichever note is being generated by Voice one and the generates either: 1 octave below, 2 octaves below or 3 octaves below
- Voice Three Toggle -Pitch 2 (Red strip) References note generated by Voice one and generates either: 1 octave below, p4 or p5 below, ma 2 or mi6 below
- Voice Four Toggle - 8ve - (Dark Red strip) = References whichever note is being generated by Voice three and the generates either: 1 octave below, 2 octaves below or 3 octaves below
- Decay and infinite sustain options - you can set each voice independently to have an incredible crisp, staccato feel, or a gentle decay
(You can set the duration of the decay independently on each channel) or set it to an infinite sustain - where the synth will lock onto the note you’re playing and will
only change pitch when you change the note on your guitar.
- Flux dial controls the “spring” or glissando between notes.
- Flux Toggle - right position engages the flux option. Left position disengages. Left position enables a staccato option with great tracking.
- Seperate Dry level control.
- External Dry out (so you can split the Synthotron III between two amps - one carrying clean signal, the other carrying synth.
- External CV in.
- External Trigger in.
FILTER SECTION
- Select between - Sample Hold Mode, Envelope Filter Mode and Manual Sweep Mode (via exp pedal).
- Velocity and Freq control the speed and frequency range of the filter
- External Exp jack for controlling frequency range with an external exp pedal when in expression pedal filter sweep mode.
- External Exp jack for controlling filter section LFO speed with an external exp pedal.
CHORUS SECTION
- All analog chorus section (based around the Empress Deus Chorus) - using a NOS MN3007 bucket brigade chip.
- Twin voice settings allow selection between a warm CE-1 styled chorus or a bright shimmery chorus
- Velocity controls the chorus speed
- Mix controls the blend of wet and dry signal
- Depth controls the depth of the chorus effect
SUMMARY
Each of the three effects in the Synthotron III (Synth, Filter, Chorus) can be used independently or simultaneously. Three incredible, ultra dial-able analog effects in one enclosure.
Each of the three effects in the Synthotron III has it’s own foot-switch allowing ease of engaging/ disengaging each section of the pedal.
The Synthotron III is true bypass so will not impact your tone when not engaged. It runs off a standard DC 9 volt pedal power supply. Inside the Synthotron it takes the 9 volts and converts to 18 volts for maximum headroom and stability.
The Synthotron III is the most unique sounding pedal I have ever created. Synthotron I and II were unique, but also quite polarising - the inherent challenges with
tracking meant that people seemed to either adore it or be utterly mystified by it. Synthotron III offers all the things people loved about it’s predecessors, but a vastly improved and expanded design.
This is the only pedal in the world that can create these sounds. There are thousands of Fuzz pedals, Chorus pedals and overdrive pedals. But only ONE Synthotron.
Each pedal will be hand signed and numbered by me, Ben Fulton.
Specs
- True Bypass
- 100% Analog
- 9 Volt DC - from any standard guitar pedal external power supply. Tip negative.
- 130mA current draw
- Dimensions: 144mm x 121mm x 56mm
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.6 ★★★★★
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Product Reviews
★★★★★ 5
Much Needed Cabin Air Filter Replacement!
This Cabin air filter replacement is working well. It had been a long time since I replaced my cabin filter, so this was a much needed replacement. It was easy to do, and a much needed replacement. The air quality inside my car is much better. It smells fresh, and light and airy now.
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Reviewed in the United States on March 29, 2026
★★★★★ 5
Best cabin filter I've ever seen
This is the most complex and over-engineered cabin air filter I have ever seen, and I mean that in a good way! The overall shell is a hard plastic, and inside it are two basic parts; the filter (HEPA quality) and the loose fill activated charcoal. The filter media appears to be operating room quality, and if I were to guess, I would say it's like a MERV 14 or greater. The pleats are plentiful, and the spacing of the pleats are perfect, as well as the attachment of the media to the filter frame. The charcoal is a loose style fill, and it fits between the back of the filter media and the filter screen on the very back. This must have 5 times the amount of charcoal compared to the charcoal infused media you can get from many suppliers. The frame fits perfect in my 4runner, and it is hard plastic with good gasket material to further help the effectiveness of the media.
All in all, this is an incredibly engineered filter, and if you're the type that wants nothing but the best for your vehicle, you've come to the right place by choosing this one. It is pricey, at $20 for one filter at the time of writing this review, but this is a textbook case of "you get what you pay for." I am going to start only buying these from now on, as they are the best quality and construction filter I have seen, and I highly recommend this filter!
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Reviewed in the United States on November 3, 2025
★★★★★ 4
A Simple, Affordable Cabin Filter That Does the Job
I have a mechanic I really trust, which is no small thing these days. The trade off is that he charges a little more for routine services like oil changes, and those visits always include a full vehicle inspection. To manage the cost, I make a point of handling the easy maintenance items myself so he does not feel the need to replace them with higher priced OEM parts. Cabin air filters fall squarely into that category. It takes me about two minutes to replace one, and doing it myself typically saves around fifty dollars. That was the motivation behind picking up this filter for my Toyota Sienna.
Right out of the package it fit perfectly. The size is exact, which is important since cabin filters need a snug frame to work properly. There is a clear airflow direction arrow printed on the side, which is one of the two key things I always look for. Without that, it becomes guesswork and you risk installing the filter backward. With the arrow in place, installation is a quick slide and close operation.
Functionally, cabin filters are hard to evaluate in real time. You do not get a dramatic change the moment you swap them out. What I rely on instead is whether they fit correctly, whether they load evenly over time and whether they avoid shedding material as they age. Based on construction and feel, this one meets those expectations. It is pleated well and the frame holds its shape. All signs point to it filtering properly, which is the baseline requirement.
Because cabin filters need changing fairly often, it never makes sense to overspend on OEM versions unless you have a specific airflow sensitivity or unique environmental need. This filter costs far less and performs the key functions just as well for general use. In my Southern California environment, where dust and pollen appear regularly, I prefer to replace filters on the more frequent side, which makes the lower cost even more practical.
The simplicity of the whole process is what I appreciate most. No tools, no struggle, no surprises. The filter pops in cleanly, the compartment closes and the job is done. When paired with the peace of mind of not paying dealership pricing for such a simple part, it becomes an easy product to recommend. A dependable, properly fitting cabin filter at a very reasonable price. Four stars.
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Reviewed in the United States on December 4, 2025
★★★★★ 5
So premium I can't even test the quality
edit- after about six weeks of driving through various conditions I can say that the air quality this filter produces is excellent., removing all smoggy odor. There is a minor soapy smell that is not offensive, just unusual. So I am very pleased with this item.
original review-
This really seems like a premium upgrade compared to the budget filters I normally buy. Unfortunately I live in a hot and dry climate (no humidity buildup to cause musty or sour odors and AC always running which dries the air also) and I do not smoke so I never have any odor problems in my vehicle to test the charcoal feature with. I also am not prone to dust allergies so I don't know how helpful the HEPA feature is.
If I get stuck in traffic in a smoggy area or behind an especially smoggy vehicle I will switch to fresh air mode to learn if the charcoal feature helps and update this review.
There is no paperwork in the box or arrows printed on the filter to determine which way to insert it. I am assuming the airflow path is downward and should pass through the paper side first, so I installed the paper side up.
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Reviewed in the United States on November 9, 2025
★★★★★ 5
It's a fit
This was a good fit for my 2010 Camry. Way nicer than the air filter I had in there before. I don't know what all those charcoal things do but it makes me feel like my car will have better air than the rest of of life. All the packaging and labels were Chinese, so I had to take my best guess about which way the air was supposed to flow. Other than that it was pretty easy to install. Just stick it in the hole. Seems to work well, I haven't noticed any new noises. Seems like a higher end filter.
Hopefully it lasts the ten years before I change it next
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Reviewed in the United States on November 9, 2025
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