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Product 151129

T-Rex Engineering Moller Overdrive and Clean Boost Guitar Pedal   

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Stunning clean sound with just a little dirt around the edges? Solid overdrive with a tablespoon of clean sparkle to make your distorted chords stand...Read More

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Choose your mix of clean boost and dirty overdrive.

Stunning clean sound with just a little dirt around the edges?

Solid overdrive with a tablespoon of clean sparkle to make your distorted chords stand out?

Fire-breathing distortion with just a dash of clean signal for better definition?

The T-Rex Moller is a classic overdrive guitar pedal that provides a wealth of dynamic overdriven tones with superb tonal control, as well as separate transparent 0-20 db adjustable and switchable clean boost, and a unique overdrive/clean mix option.

The mix knob lets you dial in the perfect balance between distorted and non-distorted signal. Rolled all the way up and with distortion maxed too, the effect pedal sounds just like an old tube amp on full volume.

Roll the mix knob back a bit, and your clean signal starts to get through, meaning that if you pick lightly, or roll back the volume on your guitar, you get a stunning clean/softly clipping sound that retains all the feel and dynamics of your original tone, only bigger, louder and richer.

The boost function lets you dial in a solo level, whether the overdrive circuit is activated or not.


The T-Rex Moller pedal was developed in 2003 for a well-known Danish guitarist called Knud Moller. He plays guitar for Johnny Madsen and has also made solo albums. He needed a good tube screamer with a clean boost, so T-Rex made him that pedal based in Alberta. Other Danish players heard and saw the effect pedal, and they also asked for one. Demand increased. T-Rex decided to improve the guitar pedal and mass produce it.

  • VOICE button
  • 2 switches (On/Off and Boost On/Off)
  • 2 jacks (signal input/output)
  • 9-12 volt DC input 2mm pin
  • 9-volt battery trunk
  • Mint green
  • TONE: Adjusts the flavor of overdrive
  • GAIN: Controls the amount of overdrive. This pedal has lots of body, even with Gain turned down.
  • MIX: Blends distorted (wet) and non-distorted (dry) signal
  • BOOST: Determines the amount of boost, from 1 - 20 db
  • LEVEL: Adjusts the output volume

Get just the right blend of distortion and clean - put it in the cart!


Review Snapshot

by PowerReviews
T-Rex EngineeringMoller Overdrive and Clean Boost Guitar Pedal

(based on 4 reviews)

Ratings Distribution

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Reviewed by 4 customers

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(0 of 1 customers found this review helpful)


Perfect in every way.

By Zounds2393

from Grant, Michigan

About Me Professional Musician


  • Compact Design
  • Excellent Sound Quality
  • Responsive


    Best Uses

    • Home Studio
    • Performances
    • Professional Recording

    Comments about T-Rex Engineering Moller Overdrive and Clean Boost Guitar Pedal:

    This is the best sounding overdrive I have ever heard, and worth every penny! The best description that comes to mind is very creamy, and smooth with a pinch of crunch. Very well rounded tonally. The clean boost gives such a nice color I have just started to just leave on all the time. If your looking for a really extreme distortion, this is not what you want. This has a much smoother overdrive, like that of a tube amp. If a pedal makes me want to play more, it's a great pedal (I play a lot already) and every time I sit down to play I get excited because of this pedal. I guess it makes me a geek, but sincerely....I love this pedal.

    (2 of 2 customers found this review helpful)


    Incredible OD!

    By g00b3rsVAN

    from Southern California

    About Me Experienced


    • Compact Design
    • Excellent Sound Quality
    • Good Selection Of Effects
    • Responsive
    • Versatile


      Best Uses

      • Amateur Recording
      • Home Studio
      • Performances
      • Professional Recording

      Comments about T-Rex Engineering Moller Overdrive and Clean Boost Guitar Pedal:

      It's been my second day with this pedal and I still and will have the same love for it as I did when I first turned it on. Absolutely amazing OD, the best I've played or heard. Some say its like a ts808, the midhump on this isn't harsh at all. It's very nice and warm. VERY responsive to picking dynamics. Right now, I'm using this, a Signa Drive, and a Spark booster to cover all my drive-needs. The clean boost on this is incredibly clean and loud. I should also mention that the clean boost is post-drive, so turning on the boost is just going to make you sound louder and not so much with boosting your drive to be louder. This pedal is pretty pricey if you think of it as a single pedal, but it's really 2 in 1. The clean boost is independent.

      (1 of 8 customers found this review helpful)


      a mediocre pricy pedal

      By Themule

      from Undisclosed

      Comments about T-Rex Engineering Moller Overdrive and Clean Boost Guitar Pedal:

      I don''t get the first reviewer who indicated he owns the product but don't use it?
      I owned this product and after one gig, I sent it back to where it belongs...
      The overdrive practically adds boost. In order to start getting real overdriven, tube-like sound, you have to put the gain all the way up and the mix all the way up and your guitar volume all the way up. In itself, it may be what one might be looking for, but when you have other pedals in the mix and you want to control your overl sound level and tone, you get 'out of control' playing with the knobs back and forth and it's driving me nuts... plus it is noisy in those levels (especially when you turn the master level up to get the sound cut through and your guitar all the way up to get the overdrive, it over accents the guitar's pickup hums and that's too much to bear...). The clean ads additional boost which might be OK for some playing styles or solo but again only when you get you overall sound intact.. other than that it didn't deliver what I had in mind it would. I switched to Carl Martin which is on its way and i think I will be happier.

      (6 of 7 customers found this review helpful)


      TRex is two in one

      By Northern Exposure

      from Frozen Tundra

      Comments about T-Rex Engineering Moller Overdrive and Clean Boost Guitar Pedal:

      The Moller is a little pricey, but you get a lot of control. A nice warm distortion similar to a od808, but you can add in clean signal for sparkle, and a "fat" switch which works good with my tele, or strat. I love the clean boost channel which I use to kick up my leads just a little. I use it at the end of a chain which includes a compressor,delay Ibanez Ts 9,and Maxon Od808. I use the maxon at full distort, the ts 9 at a lower distort for an SRV blues sound and the Moller at about 2/3 distort with some clean signal mixed in so I have 3 levels of distort sound, and I can always combine them. When you run the Trex last in the chain, the lead boost will boost everything in front of it without changing the tone, and with just as much db gain as you like. I like all 3 of my overdrive pedals for different reasons, but I would choose the Moller for its control, and that clean boost channel for leads, and a distort very similar to (not better)than the od808 distortion. The TS 9 doesn't have quite the "bite" and adds a bit more coloration than the other two.

      Displaying reviews 1-4

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