The Electro-Harmonix Q-Tron Plus is an Electro-Harmonix envelope filter pedal, currently around $162.43. Close alternatives include the Aitone AT-08 and the IVY Filter IV v2. It pairs well with the Park P50 Classic and the Bad Cat Cub.
Electro-Harmonix Q-Tron Plus
Electro-Harmonix · pedal
The Electro-Harmonix Q-Tron Plus is an envelope-following filter pedal delivering dynamic, funky tones responsive to pick dynamics and guitar volume. Its three-band EQ and mix control provide extensive tonal shaping from subtle color to dramatic expression effects. The Q-Tron Plus remains popular for creating responsive, expressive sounds in funk, rock, and experimental contexts.
What stands out
“Standout weakness: requires a 24V power supply incompatible with most standard pedalboard power bricks, and placement in the signal chain matters for getting the best filter response”
— from the community notes
“The Electro-Harmonix Q-Tron Plus is an envelope-following filter pedal delivering dynamic, funky tones responsive to pick dynamics and guitar volume”
— from the listing
“Strengths: mode switching for genuinely different filter characters, responsive touch dynamics, and a compact footprint relative to earlier Q-Tron models”
— from the reviews
“The Q-Tron Plus delivers versatile envelope-filtered tones across guitar and synth signals, with switchable LP/BP/HP modes and a Peak control giving real sound-design range beyond a single fixed filter voice”
— from the reviews
“its three-band eq and mix control provide extensive tonal shaping from subtle color to dramatic expression effects”
— from the listing
- filter
- dynamic
- responsive
- envelope
- mix
- expressive
- boost
- synth
Price updated Oct 23, 2026
Genres the Electro-Harmonix Q-Tron Plus is commonly used in
- Funk
- Experimental
- Rock
- Soul
cited
Inferred from shared tonal signals, not a stated genre tag. - Electronic
cited
Inferred from shared tonal signals, not a stated genre tag. - Bedroom Pop
cited
Inferred from shared tonal signals, not a stated genre tag.
Amps that pair well with the Electro-Harmonix Q-Tron Plus
Park P50 Classic
Park
40% matchshapes the dynamic responseShapes how the tone responds to picking dynamics rather than its frequency or gain. (dynamic → compressed)
Park P50 Classic leans this dynamic tone toward compressed, which it doesn't make on its own
Comes later in the signal chain
Bad Cat Cub
Bad Cat
37% matchshapes the dynamic responseShapes how the tone responds to picking dynamics rather than its frequency or gain. (dynamic → compressed)
Bad Cat Cub leans toward harmonically rich, and that's a real, usable character to pair with
Comes later in the signal chain
Ceriatone British Style 2525
Ceriatone
tonal matchComes later in the signal chain
Into a dynamic tone, Ceriatone British Style 2525 brings a pull toward compressed that's missing
Vox AC30S1 OneTwelve 30W 1x12 Combo
Vox
tonal matchComes later in the signal chain
Into a dynamic tone, Vox AC30S1 OneTwelve 30W 1x12 Combo brings a pull toward compressed that's missing
Mesa/Boogie Stiletto Deuce Stage II
Mesa Boogie
tonal matchComes later in the signal chain
Mesa/Boogie Stiletto Deuce Stage II leans this dynamic tone toward compressed, which it doesn't make on its own
Friedman Small Box 50W EL34 Amp Head
Friedman
tonal matchComes later in the signal chain
Friedman Small Box 50W EL34 Amp Head leans this dynamic tone toward compressed, which it doesn't make on its own
Fryette Power Station 100
Fryette
tonal matchComes later in the signal chain
Fryette Power Station 100 leans this dynamic tone toward compressed, which it doesn't make on its own
Kustom HV30 Tube
Kustom
tonal matchComes later in the signal chain
Kustom HV30 Tube leans this dynamic tone toward compressed, which it doesn't make on its own
Pedals that stack with the Electro-Harmonix Q-Tron Plus
Origin Effects RevivalDrive
Origin Effects
37% matchshapes the dynamic responseShapes how the tone responds to picking dynamics rather than its frequency or gain. (dynamic → compressed)
Into a dynamic tone, Origin Effects RevivalDrive brings a pull toward compressed that's missing
Comes later in the signal chain
Dunlop MXR Distortion Plus
Dunlop
37% matchshapes the dynamic responseShapes how the tone responds to picking dynamics rather than its frequency or gain. (dynamic → compressed)
Dunlop MXR Distortion Plus leans this dynamic tone toward compressed, which it doesn't make on its own
Comes later in the signal chain
Keeley Halo
Keeley
18% matchsits in the right chain slotPlaced for where it does its job cleanly in the chain, not for a tonal interaction with the anchor.
Run Keeley Halo after Electro-Harmonix Q-Tron Plus in the signal chain, where it won't crowd Electro-Harmonix Q-Tron Plus — goes in the amp's FX loop (or last, into a clean amp)
Comes later in the signal chain
JHS Lucky Cat Delay limited edition
JHS Pedals
17% matchsits in the right chain slotPlaced for where it does its job cleanly in the chain, not for a tonal interaction with the anchor.
Keep Electro-Harmonix Q-Tron Plus's dynamic voice out front: JHS Lucky Cat Delay limited edition goes after Electro-Harmonix Q-Tron Plus in the signal chain so its pristine voice doesn't muddy it — goes in the amp's FX loop (or last, into a clean amp)
Comes later in the signal chain
DigiTech DOD Compressor 280
Digitech
tonal matchComes later in the signal chain
DigiTech DOD Compressor 280 leans this dynamic tone toward compressed, which it doesn't make on its own
DigiTech XBS Bass Squeeze
Digitech
tonal matchComes later in the signal chain
DigiTech XBS Bass Squeeze leans this dynamic tone toward compressed, which it doesn't make on its own
Fairfield Circuitry 20% More
Fairfield Circuitry
tonal matchComes later in the signal chain
Fairfield Circuitry 20% More leans this dynamic tone toward compressed, which it doesn't make on its own
Tech 21 CompTortion
Tech 21
tonal matchComes later in the signal chain
Into a dynamic tone, Tech 21 CompTortion brings a pull toward compressed that's missing
Cheaper alternatives
Behringer Meatball Restyled
Behringer
70% similarityShared character: fx loop, wah, filter
Electro-Harmonix XO Micro Q-Tron
Electro-Harmonix
69% similarityShared character: peak, natural resonance, filter
Electro-Harmonix Nano Q-Tron
Electro-Harmonix
65% similarityShared character: peak, mono synth, natural resonance
Electro-Harmonix Micro Q-Tron Envelope Filter
Electro-Harmonix
64% similarity“A smaller, more pedalboard-friendly version of the Q-Tron, suited for funk, soul, R&B, and expressive rock or bass playing”
Carl Martin Ottawa
Carl Martin
64% similarityShared character: mono synth, wah, natural resonance
Behringer B-Tron III Envelope Filter
Behringer
63% similarity“budget construction means sensitivity response and tracking quality may not match premium envelope filters like the Mu-Tron III or EHX Q-Tron”
Boutique & premium upgrades
Xotic Robotalk 1 New Old Stock
Xotic
58% similarityShared character: mono synth, filter, response
Maxon AF-9 Auto Filter
Maxon
58% similarityShared character: peak, natural resonance, filter
Spaceman Artemis Modulated Filter
Spaceman
55% similarityShared character: mono synth, filter, touch
Ashdown Type 23 Three Band Filter
Ashdown
95% similaritysimilar tone character
Pigtronix Resotron Analog Tracking Filter
Pigtronix
94% similaritysimilar tone character
Death By Audio Deep Animation
Death By Audio
94% similaritysimilar tone character
Similar charactersee all similar tone character →
Aitone AT-08
Aitone
65% similarity“reviewers compare its sweep character to the Electro-Harmonix QTron, suggesting it achieves comparable tonal results at a lower price point”
IVY Filter IV v2
Ivy
59% similarityShared character: wah, filter
Emma DiscomBOBulator
pedal
58% similarityShared character: mono synth, wah, filter
Guyatone WRm5 Wah Rocker
Guyatone
57% similarityShared character: wah, filter, mix
Electro-Harmonix Pico Swello
Electro-Harmonix
57% similarityShared character: mono synth, wah, response
Subdecay Proteus MKII Sample
Subdecay
57% similarityShared character: mono synth, natural resonance, filter
See all alternatives to the Electro-Harmonix Q-Tron Plus (cheaper + boutique) →
Questions people ask
What are good alternatives to the Electro-Harmonix Q-Tron Plus?+
The closest matches in character are the Aitone AT-08, the IVY Filter IV v2, the Emma DiscomBOBulator. Budget picks: Behringer Meatball Restyled, Electro-Harmonix XO Micro Q-Tron, Electro-Harmonix Nano Q-Tron. Boutique upgrades: Xotic Robotalk 1 New Old Stock, Maxon AF-9 Auto Filter, Spaceman Artemis Modulated Filter.
What pairs well with the Electro-Harmonix Q-Tron Plus?+
Strong matches from rig and tone-complementarity evidence: Park P50 Classic, Bad Cat Cub, Ceriatone British Style 2525 — Park P50 Classic leans this dynamic tone toward compressed, which it doesn't make on its own.
How much does the Electro-Harmonix Q-Tron Plus cost?+
Around $162.43 (live listing price, updated Oct 23, 2026).
Compare
- vs Maestro Agena
- vs Carl Martin Ottawa Vintage Optical Envelope Auto-Wah/Envelope Filter
- vs Ashdown Type 23 Three Band Filter