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!

Today the message is unpleasant.  After figuring how to deal with some of our government’s policy decisions for the past several years, I must finally admit defeat.  It is not feasible to continue operations with the latest round of policy changes.  As recently as a few days ago, I thought it might work out.  Then I was hit with business-ending tariff charges, with more to come.  To be clear, it isn’t just these new Trump tariffs that have beaten me.  Biden-era tariff changes and policies were also difficult to survive.  The cumulative effect is too much.  

As an entrepreneur I take calculated and managed risks.  Sometimes it works out, and sometimes I seem to be shooting at my own feet.  But I can’t survive an economic nuking from my own government.  It’s not just a political disagreement, or differing opinions, theories, or expectations.  It’s a matter of undisputed facts, real dollars.  Gerlt Technologies’ “Game Over” criteria were met this week as those facts became crystal-clear.  I don’t like politics and refuse to take part in it, so I’ll just leave it at that.

Gerlt Technologies will no longer take new orders for our effects.  We do still have our popular 3U Pedal Racks available until our inventory is depleted.  New tariffs on metals will make them too expensive to restock, so get ‘em while we’ve got ‘em!  I have a handful of new modules that I’ll be completing soon.  I’ll still announce them when they are finished, just ‘cause.  We were already contemplating thinning out some of our guitars, amps, pedals, and maybe some components and other gear that have somehow quietly filled up all our available space over the past several years.  We may add some listings for those on the site or perhaps on Reverb in the coming months.  Keep an eye on us if you are interested in some lightly used gear in great condition.  I expect and plan this shutdown to be permanent, but maybe I’ll pop up and take a look around in a couple of years if enough major changes take place in government policy after the mid-term elections.   

It has been a lot of fun!  I enjoyed meeting thousands of you along the way – always the best part of any adventure.  Thank you all, and all the best to you and yours!

Bill Gerlt

President, Gerlt Technologies

26 August, 2025

 

New Module: Moonquake

Published: 23 April 2022 23 April 2022

 

 

Hello, Effects Fans!

Today we announce our new Moonquake module.  The GT Moonquake compares to the 4ms Tremulus Lune optical tremolo.

The Tremulus Lune appears to be discontinued from 4ms Pedals, although you may still find a new one here or there.  3ms and Commonsound are earlier names for 4ms Pedals, and some early Tremulus Lune builds show those brands.  The pedal was also sold in kit form and became popular in the DIY pedal-building community, leading to many other "brands" and versions of the circuit, from builders of all skill levels.  Kit builds are sometimes available but may be of widely varying quality.  Even the production builds vary in quality, some of which perhaps shouldn't have been released due to build quality issues.  We've only seen a few of these pedals, all of which had dodgy construction.  The brand new one we purchased for testing is noisy enough to not really be usable, probably from layout and construction issues.   

So how did the GT version turn out?  

First, tremolo is probably the simplest effect there is.  You can do much the same thing by just turning the volume up and down, which is really all tremolo is.  Even in the GT world of customizations, this circuit goes well into "tweaker paradise", with 6 controls instead of the normal 1 or 2.  That's pushing it for regular use, but convenient for when you're searching for "your tremolo".  We like our tremolo simple, so we're a bit at odds with the purpose of this circuit.  Many, many players enjoy this tremolo, so our opinion is just one.

Setting aside the amazing array of controls, how is it?  Well, to us it is still a noisy circuit.  However, there is a Gain control that lets you dial down the gain AND the noise.  To get to "quiet" you have to dial the Gain to "barely on", which might get you below unity volume, or pretty close to it.  Once you dial back the Gain to unity volume or minimal boost, the circuit becomes much more manageable.  We won't attempt to describe the huge variety of tones you can get by adjusting those other 5 knobs to the millions of potential settings.  It's hard to imagine that you can't find your tremolo sound in there somewhere.  Can you find it twice is maybe the more interesting question.

Most tremolo circuits have only a couple of controls, but the Tremulus Lune has half a dozen, most rarely found on any other tremolo circuit.  It's odd to think of that many ways to control volume changes, but they are there.  The Tremulus Lune circuit has some popular modifications that are included.  The first is that external Gain control, instead of the normal internal trimmer.  This makes it easier to adjust for unity volume, or other volume settings for that matter.  The Gain gets pretty high and can lead to distortion if you crank it up.  Cleaner settings are in the "barely on" range of the Gain control.  It is also key to controlling the noise in the circuit.  All those controls are a tweaker's paradise, providing options that we haven't seen in other tremolo circuits.  It can take a while to find settings you like, but maybe also the wide variety of unusual settings will provide you with some unique effects that you enjoy.

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