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3Leaf Audio Proton Envelope Filter

^# 26

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$264.60 Price Tier: High-end

5.0 (5)

2 Critic Reviews

2 Reviews

Find out who is using 3Leaf Audio Proton

1 community setup

3 wishlisted

12 saved

Page last updated Jun 28, 2026

Pricing and availability

We compare 600+ stores and found this item at 1 store. Prices updated June 28, 2026.

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Reviews

Price

5.0 (31)

$264.60 7 available Used

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Average Price: $265

High-end/Boutique

$70

$251+

Price Tier

In the Filter Effects Pedals category, 3Leaf Audio Proton Envelope Filter is priced in the High-end/Boutique range. This premium gear is built to very high standards and offers premium features.

Budget

Standard

High-end

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Description

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Unleash a spectrum of funky tonal possibilities with the 3Leaf Audio Proton Envelope Filter, a pedal that harmoniously bridges vintage vibes with modern innovation. Inspired by the legendary Mu-Tron III, this compact powerhouse delivers the signature quack and wah effects that have shaped countless iconic tracks. Perfect for guitarists and bassists alike, the Proton stands out with its intuitive design and responsive controls that make dialing in your desired sound a breeze.

The Proton is built with studio-grade components, ensuring pristine audio quality and reliability on stage or in the studio. Its versatile control set includes Gain, Peak, Decay, Sweep, and Tone, allowing for nuanced adjustments that cater to a wide range of musical styles. Whether you're crafting subtle textures or bold, dynamic sweeps, the Proton responds with precision and character.

Furthermore, the Proton features a compact, pedalboard-friendly design, making it an ideal addition to any setup without sacrificing valuable real estate. With its robust construction and superior performance, the 3Leaf Audio Proton is the perfect tool for musicians seeking to elevate their sound with rich, expressive filter effects.

Key Features:

Inspired by the classic Mu-Tron III envelope filter
Studio-grade components for superior sound quality
Controls for Gain, Peak, Decay, Sweep, and Tone
Compact, pedalboard-friendly design
Suitable for both guitarists and bassists
Durable construction for reliable performance

Videos

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Prymaxe

3Leaf Audio Proton Envelope Filter

Prymaxe

3 Leaf Audio Proton Envelope Filter - Bass Demo

Zachary Rizer

3 Leaf Audio Proton

Mike Hermans

3Leaf Audio Proton Envelope Filter Quick Test

Rock Rock Music Gears 搖滾磐石樂器

Reviews

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PROS

Mimics the classic Mu-Tron III sound closely
Versatile, offering a wide range of sounds
More user-friendly and easier to power than vintage models
Tracks well with different types of guitars
Compact and fits well on pedalboards
Consistent and controllable, avoiding signal-chain hassles
Well-made and solid construction
Excellent for playing chords with beautiful voicings

CONS

Some users may find it challenging to dial in specific tones
May not perfectly replicate the "fat/juicy" Mu-Tron III sound for all users

Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about 3Leaf Audio Proton Envelope Filter.

Features and functionality

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The v4 Proton's circuit redesign reportedly results in less tone coloration compared to the v3, with specific settings for range, gain, peak, decay, and tone.
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Owners find that the Gain and Peak controls are extremely subtle, requiring fine tuning but offering great sound in nearly any setting.
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The Proton features a unique "Decay" knob, which is not commonly found on other envelope filters and is highly praised for its impact on the filter's responsiveness.
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The Proton includes a switch to control sweep direction, enhancing versatility and ease of use when dialing in desired sounds.
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User experience

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Owners highlight the challenge in acquiring 3Leaf Audio Proton pedals due to limited small batch releases and the prevalence of flippers in the market.
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The v3 Proton is deemed versatile enough to be used effectively on a piano board, showcasing its adaptability beyond typical guitar setups.
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It's been noted that the pedal works exceptionally well following a fuzz and an EP boost, adding versatility to the setup.
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Owners report the Proton is pedalboard-friendly due to its compact size and soft switch, making it convenient for live performance setups.
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Build quality

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The Proton Envelope Filter is noted for its robust construction, being described as "made of dang STEEL."
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The Proton is noted for its attractive finish options, making it a visually appealing addition to any pedalboard setup.
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Use cases and applications

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Positioning the pedal after overdrive can give it a "nastier" character that shapes the overdrive tone distinctly.
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Value and pricing

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One owner mentioned acquiring the pedal at a significant discount, highlighting its potential value when found at a good price.
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Comparisons

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The Proton is frequently compared favorably to the Mutron USA Micro-Tron III, particularly for its ease of dialing in sounds and larger "sweet spot."
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Critic Reviews

3 Leaf Audio Proton Envelope Filter

guitarinteractivemagazine.com

The 3Leaf Audio Proton Envelope Filter delivers a punchy funk vibe, encapsulating the essence of the iconic Mu-Tron III while offering a compact design and user-friendly controls. Its simplified layout doesn't compromise on sound flexibility, allowing for rich, dynamic tones that can cut through any mix. With the Proton, Spencer Doren has crafted a pedal that appeals to both seasoned musicians and newcomers alike. However, the absence of attack and decay controls might be a downside for those seeking more detailed sound sculpting. Overall, the Proton stands out as a versatile and accessible piece of gear for any funk enthusiast's pedalboard.

positive

Full Review