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!

As you might guess, things are going a little slowly for us as everyone shifts into low gear for a while.  But that’s OK – low gear is the most powerful gear!  So we continue to move forward with developing new rack effect modules.  Today we announce the availability of our Little Rock phaser module.  The Little Rock compares to the EHX Small Stone Phaser, one of the most popular phasers of all time since its debut in 1974.  The simple controls and lush, liquid swirl have spiced up everything from jazz, blues, and country to pop, grunge, and rock. 

There have been numerous versions of the Small Stone phaser over the decades.  Our Little Rock compares most closely to v2 and v3, which are the preferred versions for most.  In addition to the simple Rate control and Color switch, we have half a dozen extra options to choose from to tailor it to your likings.

One random note about the different versions of the Small Stone.  Some of the circuit versions look much different from others.  All use several IC chips, but some also have a bunch of transistors in addition to the ICs.  Those extra parts must be doing something, right?  Yes, those transistors are important.  But if you notice carefully, the IC is different in the versions with and without the “extra” transistors.  The difference is that one IC version has those extra transistors already built into the chip.  That was the original early versions of the Small Stone, using CA3094 ICs.  The extra transistors are not needed with the CA3094 (or EHX part number EH1048).  If the other version of the chip is used, the CA3080, you must add those transistors since they aren’t built-in on the chip.  That makes the circuits look completely different, but they really aren’t that different at all.  It is unlikely your ears could tell the difference between the two IC/transistor configs.  The other significant difference between versions involves parts in the LFO section of the circuit.  The audio signal doesn’t go through the LFO, so those differences have no direct impact to the sound.  The LFO gives you the ability to control the Rate (Speed) of the phasing.  Of course, in our usual GT style, our boards are designed to work with either IC/transistor config.  The original CA3094 parts are difficult to find, but we try to keep them in stock.  You can request either IC.

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

It’s difficult to provide accurate time estimates right now, but we have a significant number of new modules winding their way through our R&D process.  The list includes some great effects you probably know and some others you may not have had a chance to try yet.  Watch here for more announcements coming as soon as we can get back to second or third gear!