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!

If you like chorus effects, then you are probably well aware of the famous Roland SDD-320 Dimension D rack chorus.  When it was in production back in the 80’s, it seemed almost everyone used it live and/or in the studio.  Many are still in use today, although they cost considerably more than most pedals and sometimes need some service to return them to top operating form.  In 1985, Boss released the Dimension C DC-2 Chorus pedal.  It was very similar in design and sound, but came in the normal Boss pedal format – sort of the “little brother” to the rack version of the circuit.  Used ones in good shape fetch stiff prices.  They went out of production in 1989, but have recently been revived in the Boss Waza pedal line.  Today we announce our Stereo Chorus module, which compares to these great chorus effects, most closely to the Boss Dimension C DC-2 pedal.

Both the SDD-320 and DC-2 are simple to operate.  They have push-button settings.  The DC-2 pedal had four of them.  No knobs, no options – just 4 well-chosen presets and an on/off stomp switch.  The cool thing about these chorus units is that they are “motionless”.  If you are used to more common chorus effects, you know that changing up the standard Rate and Depth controls will give you variations in the “wobble”, from subtle thickening to wild and spacey “seasick” motion.  Motionless chorus doesn’t do that.  It operates by having two separate delay channels out of phase with each other.  The effect is much more subtle, but very pleasing.  Pleasing enough to be an “always on” effect.  It’s almost like two chorus circuits in one effect, making for a complex and (sorry!) more expensive circuit to build.  At first you may think the presets aren’t working if you haven’t used a motionless chorus before.  But listening more carefully, you’ll “get it”.  Some think it is the ultimate in chorus, avoiding the over-the-top settings.  All presets are extremely usable.  If you like the bigger and wobblier chorus, or a more Leslie-like rotary speaker feel, there’s nothing wrong with that, but this may not be what you want.  If you want that subtler, always-on, thickness and depth, this design delivers like no other. 

Our implementation stays very close to the DC-2 design, using the same MN3207/MN3102 BBB/clock chip pairs.  The elaborate filtering and companding in the circuit design can result in a relatively low-noise chorus effect.  We use toggle switches instead of push buttons, giving you 6 presets instead of 4, with 4 of them being identical to the originals.  We also offer up standard Rate and Depth controls instead of the toggles if you prefer to dial in your own settings.  Or if you can't decide, you can have both the toggles and the controls and switch between them.  The circuit has a number of transistors and diodes in the control portion of the circuit that are not in the audio path.  They aren’t special in any way, but some of them are now very expensive and difficult to find.  We use better and more affordable parts for those instead, with no impact at all on the tone of the circuit.

Like the DC-2 pedal, you can run the module in mono or stereo mode.  Some feel that stereo mode makes the motionless chorus seem bigger, but you still won’t get anywhere near the wobble or separation of other chorus designs.  That’s just not what this chorus does, thankfully!  Not only is it good to have a great variety of effect choices, it’s good to have great choices!

You can see the details about our Stereo Chorus at: Stereo Chorus.  Or look for it in our list of modules in the Chorus section, along with our great VibraChorus configurations, Small Chorus, and Black Pearl chorus modules. 

BTW... For those of you who have used Search on the Home page of our website, you’ll find the results are displayed much better now.  They used to be displayed at the bottom of the page, which made them difficult to find.  Now they are at the top, easily seen, like they should be.