Designed by Mike Beigel, inventor of the legendary Mu-Tron III envelope filter.

Electro-Harmonix' Q-Tron+ Envelope Filter pedal is the classic envelope follower with effects loop. Place your favorite effects between the preamp and filter section without changing the envelope drive. Be creative with the effects you plug into the FX loop and invent totally new sounds. Ratify your Mojo!

Electro-Harmonix XO Q-Tron Plus Envelope Filter Guitar Effects Pedal Features:

• Controls: Mode, Response, Range, Peak, Gain, Boost.
• Sweep Switch.
• 1/4" input and output, 1/4" effect loop
• DC power input for battery replacement.
• LED indicates whether effect is engaged or bypassed.
• Second LED indicates signal overload.
• 24DC-100 power supply included

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Electro-Harmonix XO Q-Tron Plus Envelope Filter Guitar Effects Pedal Specifications:

• Drive (Up/Down)
• selects direction of filter sweep : upwards or downwards.
• Norm/Boost
• Normal mode allows setting the Gain control without changing the output volume.
• Peak (Q on the Mini Q-Tron)
• Determines frequency peak of filter. Makes more "effected sound" when turned up more.
• Gain
• Functions as both a volume control and a filter sensitivity control in boost mode. In normal mode it acts only as a filter sensitivity control, unlike the Mutron-III which also changes the unit's output volume.
• Range (Hi/Lo)
• Emphasizes vowel like sounds in low position, overtones in high position.
• Mode (LP/BP/HP/Mix)
• Select the filter used by the effect: Lowpass, Bandpass, Highpass or a mix of Bandpass with dry unprocessed sound.
• Response (Slow/Fast)
• Selects either a slow, smooth, vowel-like attack or the fast, snappy response of the original Q-Tron.

Electro-Harmonix XO Q-Tron Plus Envelope Filter Guitar Effects Pedal

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Average of 5 User Ratings

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Good Stand Alone

Posted by Billy Classic from Utah on Nov 6, 2009

Experience w/product: I own it

Reviewer's Background: 14 years, 2 years teaching and university

Reviewer's Play Style: rock/funk jazz/prog rock/ blues rock

I owned this pedal for a few months while in a funk/jazz/prog rock band. The unit really sounds great when it is the only pedal in the chain. The problem is that I like to have at least 3 different guitar tones and this pedal colors your tone and doesn't sound good when trying to use other pedals with it. I tried it on multiple guitar amps and even P.A. systems.

So if you need a good envelope sound and nothing else buy this pedal, or if you can get a splitter and run 2 different pedal chains (I did this for awhile but got sick of doing it) then this pedal will work great for you. But if you plan on using multiple pedals in a single chain I would avoid this unit...

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Bassists: Don't Bother! (get BOSS AW-3 /MXR M-188)

Posted by Jako from Cleveland, OH on Feb 19, 2009

Experience w/product: I own it

Reviewer's Background: Multi-Instrument Musician >30 years

Reviewer's Play Style: Rock mostly (classic to modern)

I bought this because I had read somewhere that bassists could use it. Even EHX says that bass players can enjoy this effect. I tried it out at a store and thought it was ok enough to buy, but my trial was at low volumes. When I took it to my band rehearsal and played at moderate/loud volumes, it sucked my tone completely. Sounded very wimpy. I was hoping to sound like Bootsie or Flea, but not with this thing. I'm now having trouble deciding between two competitors' products: The BOSS AW-3 (Dynamic Wah) and the MXR M-188 (Bass Auto Q Auto Wah). I like both of these and I'm trying them out and will post reviews one I make my decision!

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Qtron +

Posted by Anonymous Musician on May 13, 2008

Experience w/product: I own it

Reviewer's Background: Musician

Reviewer's Play Style: Funk, Rock, Jazz, Blues,R&B, Bluegrass, etc.

The previous review was right on except for the boost knob; one of the best features. When it is "on" the gain knob can be used to CUT the volume as well as boost it. It took me awhile to figure this out too(the manual isn't much help). EH must use the same manual from the old Qtron +. On mine, the knob names don't even match the ones on the pedal. Besides the manual, the only problem with this thing is it's very addictive. You may never turn it off. I haven't used the mini qtron but I'm sure the + is well worth extra cash. I can't imagine it without the response, range, and boost knobs or the sweep switch.

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The Best I Tried!!!

Posted by Marco Messina from Montevideo, Uruguay on May 6, 2008

Experience w/product: I own it

Reviewer's Background: Active Musician

Reviewer's Play Style: Rock, Funk, Soul, Blues.

I´m a funk lover and I was looking for a good Envelope Filter. My parents went to USA and I took the risk of buying it without trying, but when I plugged it with my bass I loved the wide range of possibilities of sound you have with this envelope filter. Simply the best I tried!!!

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Fun & Funky

Posted by mr. sizzle from green bay, wi on Feb 21, 2008

Experience w/product: I own it

Reviewer's Background: active musician

Reviewer's Play Style: everything but metal

I've been fiddling with this thing for a couple of days now, and it's quite fun. I chose this model because there's more features than the Mini Q-Tron, and less real estate that the other Q-Tron available. I'm a big fan of the up/down switch for the direction of the sweep and I usually stay in the mix pass mode (band pass combined with the dry signal). I don't use the boost function, because it puts out a quite a bit of signal as it is. I would really like to have a level out control on this thing to tame it down a lot. The Peak and Gain controls perform as exptected. The effects loop can be used to produce sonic whackiness if you have spare effects to use in it. Too bad that the effects in the loop don't work in bypass. I have the #1 Echo and the Holy Grail Plus, both of which are tough and reliable. This is in the same xo line, but it doesn't seem as rugged. Faults aside, it's quite an interesting envelope filter and I'm going to start using it.

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Electro-Harmonix XO Q-Tron Plus Envelope Filter Guitar Effects Pedal

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