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



Yes, it is time for another new module.  Today we announce our Green Light module.  It compares to the Mad Professor Little Green Wonder (LGW).  The Green Light is technically a close relative of the Tube Screamer, sort of a “Tube Screamer for people that don’t like Tube Screamers”.  Lower compression and more headroom, along with tweaked distortion allow it to stack well with other drive modules or amps.  It can be used to smooth out other effects that may have a bit of an edge to them.  The clipping, which contributes greatly to the overall distortion, is different from the normal silicon diode clipping found in the wide range of Tube Screamer-style circuits.  Green LEDs are used, resulting in drive that can go from mild to crunchy, but isn’t really meant to get into high-gain distortion.  Works better for blues, country, and classic rock than metal.  The Body (Tone) control also differs from other circuits in this class.  It gives you control of low mids to treble content, with a wider tonal range than your typical mid-hump green pedal clone, including a bit more on the low end.  The Green Light gives you the option for less tone coloring, and ranges from boost to Stevie Ray cookin’ blues rock.  We normally build the Green Light to run at 9V, but can go up to 18V for cleaner sound with more headroom.

You can see the details about the Green Light at:  Green Light

And don’t forget - in less than a month we’ll be at the Amigo Nashville Guitar Show in Franklin, TN, April 6-7.  Come on out to try our gear and see the best and most affordable selection of rack effects available.  Hope to see y’all there!