Klazo Drive


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Our Klazo Drive is a smooth sounding overdrive designed to dynamically transform your guitar tone without harsh fizz. Low order harmonic laden overtones abound in this tube-like, transparent workhorse.

Unlike many common opamp based overdrives that are equipped with harsh sounding clipping diodes, the Klazo Drive utilizes finely tuned MOSFET arrays to deliver musical signal clipping across the audible frequency spectrum. Several gain stages are cascaded and combined in parallel to achieve organic overdrive without nasty intermodulation distortion.

Klazo Drive not only delivers authentic sounding overdrive, but she dynamically responds to pick attack and feels similar to a real amp. This pedal is as close to an amp-in-a-box that one can get at 9V, and responds beautifully to your guitar’s volume control.

Equipped with an active dual band (bass and treble), 2nd order tone stack with powerful 15 dB of signal cut or boost, Klazo makes for an extremely versatile tone machine. One will be hard pressed not to find their own unique sound inside this pedal.

The Klazo Drive is destined to transform your tone! Any guitar. Any amp. Any venue.

Features at a glance

  • Novel overdrive topology
  • Dynamic signal clipping
  • Active Baxandall tone stack
  • Unique, space efficient enclosure
  • Top mounted jacks
  • True Bypass
  • Soft switching
  • 100% analog signal path
  • Lifetime warranty
  • Designed & assembled in the USA

Greenchild gear is designed with premium, audio-grade components and meticulous attention to detail. Our pedals will serve as valuable tools in your tone arsenal for years to come.

Semper utilis!

*Power adapter and batteries not included

Product Reviews

Score: 5 out of 5 (based on 10 ratings)
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Klazo Pedal Review
Written by Bret Marks on Apr 22nd 2020

Mason, My Klazo arrived today, so of course, I've been playing through it for the last four hours. I absolutely love it! I started the way I do with every pedal - I ran my Lucky Dog Elevangelist through just the pedal to my JCM800 clone tube amp. As expected, it sounded great (everything sounds great when used with my Lucky Dog). Then I plugged a custom Dean Zelinsky LaVoce (Les Paul clone) into it. Beautiful guitar, but what I would call very dark pickups (Dean's signature humbuckers with coil taps). I struggle to get a clean (not muddy) overdriven tone with this guitar. The separate bass and treble tone controls on the Klazo helped me get a pretty good sound out of this guitar as well (better than my other pedals), but nothing like what I can get with the Klazo/Lucky Dog combo. Then something Awesome happened. I added the Klazo to my pedal board and stacked it with my Greenchild Soul Winner. Holy Sh*t! THE tone I've been looking for and started to wonder if I'd ever find. Angry, yet clear with incredible depth. I could hear every string distinctly from the others when aggressively strumming power chords (as opposed to the overly distorted, ugly clipping you get with a lot of OD pedals). In addition, every string screamed for mercy (in a good way) when subjected to extreme bends during solo runs (even the high E string). And best of all, I was able to get these tones not only with my Lucky Dog, but with my LaVoce as well! This Soul Winner/Klazo combination, for me, is the Holy Grail for the type of Classic Hard Rock I play. Awesome pedals - thanks bud!

Written by Tom on Apr 4th 2020

This thing has some real voodoo. Right out of the box before any adjustments it was magic. A little tweaking and I was rockin . Above the twelfth fret was better than I’ve ever heard out of any of my rigs ... ever

Yup. Hits that spot.
Written by Pete Walsh on Mar 9th 2020

I play older music, (blues, classic rock... the stuff I grew up on), and many overdrives sound a bit fizzy. Close, but not the sound I am looking for. The Klazo? Yeah, it hits the spot. I like the gain around 10 o'clock, (just enough to add some bite), crank the output, and slam the front of your amp. That, for me, just sounds great. Of course, there is more gain on tap if you need that, too.

Klazo the killer
Written by Brodie Fitch on Mar 2nd 2020

I recently purchased the Klazo drive based off of reviews and video demons online. Pretty much all the reviews were for blues & classic rock players. I mostly play metal; a blend of classic thrash metal, melodic swedish death metal & modern progressive metal with hints of 90's rock like Alice in Chains & Soundgarden. Even though I play heavy and fast a lot of the time, I like tons of articulation, harmonics and melodic layers. I play both 6 and 7 string guitars and the Klazo drive sounds incredible through both. I am strictly a homestudio musician and am currently working on an album. I use the Klazo mostly as a boost into a gen 1 Krank Krankenstein with Sovtek 5881 tubes and a gen 1 Carvin V3 with JJ E34L tubes. The Carvin has always been hot but smooth. I needed a touch more snarl out it and the Klazo brought the snarl, without any extra harshness. The Klazo also helped bring out a little more low end richness without any muddiness. Now, my Krankenstein has almost too much snarl, a slightly honky midrange & and a very huge bottom end to it. Every other OD pedal I've tried in the past seemed to accentuate the honkiness. Not the Klazo. It helped smooth out the snarl, tighten up the bottom end and tame the honkiness. Now I have to go back and rerecord several songs worth of rhythm tracks because this new tone is way too killer to not use on the album. I spent the entire first day with the Klazo playing with a bunch of low and mid gain tones and it has really added a unique touch to my guitar tone. I feel it will help me play more expressively and help my guitar tone sound stand out from all the other metal players. I'm in love. If this pedal were stolen or died, I replace it immediately. I may have to pick up the other Greenchild pedals in the future and see what other tonal madness I can come up with.

Written by Joe Spallino on Nov 26th 2019

Excellent pedal. Been having trouble finding an overdrive to use with my tele bridge pick-up. Smooth, nice gain while still maintaining the “glass”...and most importantly, no “ice-pickiness”.

Incredible Pedal
Written by Trey Bentley on Sep 29th 2019

Got the Klazo a month ago, and immediately connected with it. Do you like warm butter on your biscuits??? Well, if your pedal board is a biscuit, the Klazo is the warm butter. Definitely a fan for life.

Best OD EVER!!!!!!
Written by Ron Bentley on Sep 29th 2019

Got my Klazo OD and Wow!! I always go straight to the amp with any new pedal, a test drive(no pun intended),so to speak. This pedal will not disappoint. The settings are sweet when not used as a boost,and beast when you do. For that Keith Richards break up,to pile driving OD. It's the one. It is on my pedal board,made it the first day,and it is in the company of some mighty fine pedals,they have alot to live up to,the Klazo is the king. Thanks for such a great product,the shipping was rock solid and really quick,and the questions were answered almost in real time. Amazing company,amazing pedals!! Can't wait to have the whole line of Greenchild!

Written by Mike Ryan on Jun 30th 2019

Great tone!

Klazo Drive
Written by Scott Tufts on Oct 12th 2018

I recieved the Klazo Drive yesterday and spent most of the day playing it with my Fender American Strat with Fender Lace Pickups in front of a Vox Ac-39 2x12 Blue Alnico speakers and this pedal comes as advertised. It’s a tone machine with exceptional clarity. I rolled back the gain and push the volume up and my Strat just comes alive..very touch sensitive. I pushed the gain up past the 3 o’clock position and it pushing Vox into that near breakup that you would expect from an overdrive pedal. It’s just so much range and with the tone controls you get a wide range of tones..especially when you drive this pedal. It’s a definitely always on pedal for me and it works very well with other drive pedals as far as stacking. I’m currently using it with the Greenchild Mr boost and the Reaper and it’s simply amazing..highly recommend and it’ll be a permanent part of my effects chain. Thankyou Mason and Greenchild Amps.

Klazo Drive
Written by Scott Rodolitz on Sep 24th 2018

My Klazo Drive arrived today and it's fantastic! There really is no other pedal that I know of that's even like it - the 'EQ' of the Bass and Treble allows you to totally sculpt the gain in a way that's remarkable and unique. I had bought it for my Baritone playing (and it was everything I hoped - the bass strings, even in A to A didn't muddy up, and in B to B, the higher strings really sang!) But it sounded so good, that I soon pulled out my regular guitar, and found that these same qualities shine through, and that I was able to get GREAT rich tones on it, that will make it even more useful for my regular guitar playing! In fact, I liked it so much that I took the afternoon off and played all day! Keep on making great pedals, Mason! Thank You!