Gerlt Technologies makes hundreds of customizable rack effects, at prices comparable to guitar pedals.  It's time to dump that pedal board and get Your Tone off the floor!


 What We Do

You know them as guitar pedals

We build them as rack effect modules you can customize to get Your Tone

Put several rack effect modules into a 3U rack enclosure

Connect power and audio on the back like guitar pedals, adding connections for remote switching

Add a remote footswitch unit to turn rack effects on and off

Add as many rack effect modules, enclosures, and third-party products as you like. Plug in your guitar and amp. Rock it! It's that simple.


Quick Hits:

  • Check out our GT Effects Overview to see why we do this

  • Check out our Compares To charts to see the full list of effects we offer

  • Follow the menus from Products, to Modules, to Modules By Type to get a list of our effect types.  Select any effect type to get a list of all our effects of that type.  Select any effect to get full information including pricing.



Hello Effects Fans!


I hope all is going well for you!

I’m back in the USA now, after a lengthy time away.  I’ve taken a bit of time to survey the post-post-COVID business climate and think about our next steps.   As is often the case, there are conflicting signals to sort through.  I won’t bore you with all the details.  The result is that I think the time is still not right to resume normal operations. 

One of the primary reasons is personal.  About a year ago I jumped into a really fun, non-work opportunity that took me out of the USA for most of the past year.  I will be out of the country again most of the coming year before things settle down to a new normal for me.  It’s a lot of fun, but wasn’t really part of any plan I had, so I need to adjust my plans.  I’m not able to operate Gerlt Technologies while I’m away, so the shutdown will continue for probably another year due to that until I can get my personal and professional plans realigned. 

Beyond that, the post- post-COVID situation is still unsettled.  I expected a period of ripple effects from COVID shutdowns, supply chain problems, and other world economic and political events that impact our business.  I’m starting to think those ripples aren’t going to die away and return us to something similar to the world we knew before 2020.  If some of those changes become permanent, much work and difficult decisions may be necessary.  At the moment, the parts I couldn’t obtain are now available, but some others are now unavailable.  Costs are both up and down for components, but shipping costs are now a large and growing portion of component cost and would probably force a general price increase, an action I’m very reluctant to take.  In a market that is difficult to read, it is difficult to justify additional investment.  As long as we remain cautious, we can continue to wait for time and change to bring about a better situation, even if it takes a while.

In the meantime, I will have some time to work on the less exciting “internal stuff” that is necessary to the process of building and delivering our products.  Our internal processes are a bit messy as a result of rapid product line growth, shutdown of some suppliers and vendors, and other reasons.  If we were to resume taking orders, these problems would quickly tangle up our operations.  So while we have “quiet time”, I’ll work to clean up some of those issues so we’ll be better positioned for the future.

I hope to also be doing some of the fun work, such as completing some new products, or at least moving them further along, and possibly some marketing events.  So keep an eye on us while we work through some of the issues that are holding us up at present.  I’m not sure exactly when I’ll return from my next sojourn, but it will likely be about this time next year when I pop up and take another look around to see how it looks.

Until next time,

Bill Gerlt

President, Gerlt Technologies

Dallas, Texas

21 June, 2023




Hello, Effects Fans!

Today we announce our new Evil Twin module.  It compares to the Lovetone Doppelganger.

Lovetone built a selection of outstanding, high quality boutique pedals in the small town of Henley-On-Thames from 1995 to around 2001.  During that time, they managed to set the pedal business on its ear with their imaginative designs sporting lots of controls.  Their Doppelganger was no exception.  At its heart is a 4-stage optical phaser.  What's unique is that the phasing is controlled by two separate LFO circuits, along with a variety of controls for the wave and tone.  There were two versions of the Doppelganger, the second adding an extra slow control and square wave control to LFO 1, along with a direct out jack.  Our GT Evil Twin compares to the second version of the Doppelganger.  It has the same great audio circuit, but with a few tweaks to simplify its usage and complexity without losing any of its sonic goodness.  The Doppelganger has been used by numerous artists including The Edge, Jimmy Page, members of Radio Head, Kirk Hammet, Johnny Marr of The Smiths, and others.  The originals were pricey for their time, and the low production quantities and their popularity make them pretty expensive, although not too difficult to find, today.

With the dual LFO design and numerous controls, the range of phaser/vibrato effects you can create defies description.  With the possible exception of when the Rates are set to their highest, almost every combination of settings could reasonably be used.  There aren't a lot of "spacey" or "seasick" settings to avoid.  It is tempting to describe most of the available tones as "subtle", but that's not quite right.  They can be very distinctive and obvious.  You won't get those extreme, over-the-top phasing sounds, or the jet whoosh, though.  It might fit in best with music that is slower and has some space between notes to allow this effect to shine - blues, country, ballads, folk, pop/classic rock, psychedelia ala Pink Floyd should all be great.  However, you'll need to carefully note your favorite settings so you can get them back.  For phasers, this one is pretty quiet as long as you don't allow too much noise into your input signal.  The sound is obviously going through some filters, but the result is very pleasant and "clean-sounding", giving you the feeling you are definitely playing a quality effect.  You can probably overload it and get some distortion - maybe you want to, maybe you don't - but it "plays warm and clean".  It's similar but different from a Univibe (our SwirlOVibe), but you might use it for the same types of music and in a similar manner.  A very cool and addictive effect, for sure.

While our Evil Twin gives you all the tonal options of the Doppelganger, we have made changes to some of the connection options to better fit into our rack-based line of modules.  Even after these changes, the Evil Twin is still one of our most complex and widest modules at 3" with a dozen or so controls.

You can see the details about our Evil Twin module at: Evil Twin.  Or look for it in the Phaser Modules section under Products -> Modules -> Modules By Type.