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!

In my last update I was excited after finding some small quantities of critical components that are needed to build our effects. I hoped that to be a sign that perhaps some of our supply chain problems were easing. But it seems those were just one-off lucky finds. I haven’t found any more since then. On top of all the other problems, we now have the ripple effect of the conflict in the Ukraine, which has caused even more parts to become unavailable and/or very expensive.

It’s one thing to be optimistic, but another to be unrealistic. This is no longer a time for simple optimism. It is a time for handling unpleasant realities. Our reality is that it seems very unlikely that enough positive changes will occur quickly enough for us to re-open in 2022. While the corporation is in a good position to weather a continued lengthy shutdown, the people are not able to. We need to take some time to go do “other stuff” for a while.

We still have several new modules to announce. The work is complete on almost all of them, so I’ll try to get those announcements out in April and May. Other than that, I’m afraid it is going to be pretty quiet here until we are able to reliably source parts at reasonable prices again. I probably won’t have another update until late summer or into autumn.

The good news is that Gerlt Technologies is still here and alive. We haven’t “lost” anything. We still have the largest selection of rack effects available, getting close to 400. Our effects still sound great. And we still want to make them available to you. We’re just going to have to continue our break for a while until the business and economic conditions improve to the point that we can provide outstanding products and support at affordable prices.

I apologize for the continued delay and will do everything I can to get us going again as soon as it becomes feasible.



Bill Gerlt

President, Gerlt Technologies

Dallas, Texas

11 April, 2022




Hello, Effects Fans!

Today we announce our new OverBoost module.  It compares to a family of boost pedals from Xotic Pedals.  The OverBoost comes in 8 different base configs that compare to the Xotic BB Preamp (current model), Xotic BB Pream AT (Andy Timmon, original models), Xotic BB Preamp Bass, Xotic BB Preamp MB (Mids Boost Custom Shop model), Xotic BB Preamp Comp (Compression Custom Shop model), Xotic AC Booster, Xotic RC Booster, and Xotic RC Booster Bass.

The RC, AC, and BB configurations cover a range of clean to dirty boosts.  The RC or "really clean" covers the space from clean to gritty to mild overdrive.  The AC starts at an "almost clean" level and goes up to crunchy overdrive.  The BB, aiming for the range of a Marshal Bluesbreaker amp, covers the range from cleanish/gritty to full overdrive.  Most guitar and bass players have probably had the opportunity to try at least one of the pedals in this family.  They are great boosts at reasonable prices.  Where they really shine is in giving you fine control over how much you push the front end of your amp, especially if you have a tube amp.  Depending on which you choose and how you dial in the Volume and Gain, you can get a nice, fat clean boost that gives you "more of what you've got", or you can push your amp into varying levels of break up, or shove your amp over the edge into heavy, chunky overdrive or distortion.

The circuit is similar to its tone-cousin, the Ibanez Tubescreamer.  But it has some important differences.  The BB replaces the Tubescreamer Tone control with a fixed resistor, adding a new tone stack after it that gives you great Bass and Treble controls.  These two controls also allow you better control over your mids.  The MB version puts a Mids control back into the Tubescreamer-like tone stack in place of the fixed resistor, in addition to providing the additional Bass and Treble controls.  Different types of clipping between the original/AT version and the current version yield similar but slightly different gain levels, sometimes described as different levels of compression.  The AC and RC versions leave out the old Tubescreamer tone stack completely, replacing it with the new Bass/Treble tone stack.  The AC and RC versions also differ in clipping configurations to yield cleaner base tones than the BB configuration, with the RC configuration being the cleanest of the three.

The new tone stack is important to dialing in that level of clean to dirty boost that you want.  At different levels of dirt, you will likely need to adjust different frequencies to get the tone balance you want.  A single Tone control may not be sufficient for that level of fine-tuning.  The Bass/Treble tone stack in this circuit should do the trick, especially if you opt for a configuration that includes the Mid Boost control.  An optional second channel will let you switch between two different Gain settings.

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