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 Swampodillo module.  It has multiple configurations that compare to the Schaller TR-68 Tremolo, the Cesar Diaz Texas Tremadillo, Monster Effects' The Swamp Thang, and the DIY pedal building community's Hearthrob by MarkM.

Sometime back in the 60's, maybe 1968, the German company Schaller started making a tremolo pedal designed to sound like the tremolos in Fender brown face amps.  That was the Schaller TR-68 Tremolo.  It has been out of production for many years, probably since sometime in the 80's when Schaller discontinued a number of product lines.

In the 90's, Cesar Diaz began building his own version of that circuit, which he called the Texas Tremadillo, a quirky tremolo used by some major artists.

Around 2001, Monster Effects released The Swamp Thang, which also utilizes the same circuit.  Other boutique builders have released their versions of this vintage circuit, too.  Builders in the DIY effects pedal community have also based designs on the circuit, including one by "MarkM" called Hearthrob.

Tremolo is a very simple effect.  It is little more than changing the volume by some amount at some speed with a controlling waveform.  Most of the components in this circuit are used just to alter the volume.  Few of them are in the audio path and have any direct impact on the tone, since there isn't really supposed to be any impact on the tone anyway.  So while there are some minor part differences used in the various versions of the circuit, the tone is very similar.  The differences are in the shape of the wave that controls the volume changes.

The GT Swampodillo module comes in four configurations.  Keeping in mind that the part differences are small among all of them, the Texas Thang and Swampodillo configurations are very similar, as are the German Thang and Throbodillo configurations.  Some of the differences are in how the controls work and other minor things that have little impact on the tone.  There are some differences due to the wave shape, though the differences are difficult to quantify and describe.

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