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: Earthquake

Published: 12 April 2022 12 April 2022

 

 
 

Hello, Effects Fans!

Today we announce our new Earthquake module.  It compares to the Demeter Tremulator, Fulltone Supa-Trem, and Joyo JF-09 Tremolo pedals, which all share a base optical tremolo circuit.

Tremolo is one of the simplest effects.  In its basic form, it just turns the volume up and down at some rate.  The depth is simply how loud and how close to silent it gets as the volume adjusts.  Deeper and faster tremolo can produce choppy, helicopter sounds, like the intro in Green Day's Boulevard of Broken Dreams.  Medium to low levels of depth at slower speeds can yield classic Creedence Clearwater Revival tones or give you some cool, subtle movement in your sound.  The Demeter Tremulator is considered by many to be the best tremolo pedal ever produced.  It has simple controls for a simple effect, just Depth and Speed.  The Joyo JF-09 is similar.  The Fulltone Supa-Trem adds a few extra controls to let you tweak your tremolo effect, but is essentially the same circuit as the other two.  Our Earthquake module compares to all three of those tremolo pedals.  It comes in three base configurations that differ primarily in the controls that are included.  Note that the Danelectro Tuna Melt also sounds and works similarly, but the circuit is just enough different that it isn't covered by our Earthquake module.

Overall, this is a very nice tremolo, pleasant and warm.  Ours is quieter than the stock Supa-Trem pedal we compared with.  There is no distortion if you have the Volume set properly, although our test Supa-Trem pedal does have bits of distortion or clipping now and then.

All the controls and optional controls interact to some extent, so you may have to fiddle around a bit to dial in the exact sound you want.

Without the external Volume control or internal volume trimmer, the volume in the circuit is set to a fixed level.  That level is generally OK, unless you use settings near the max or min for Depth and Speed.  Then it might be a bit above or below unity volume.  The Volume control lets you set your unity volume level.  Volume on a tremolo is a little funky.  Depending on your wave shape, Rate, and Depth, you are changing the amount of time the volume is cut, as well as the amount it is cut, affecting the perceived volume.  This usually isn't an issue with "normal" settings, but may cause lower/higher volume at some extreme settings.  Set it where you need it, of course.

Depth has a a good range, skewed more toward the shallow end, allowing good control over more subtle settings.  With the Hard/Soft switch set to Hard, higher Depth settings get very choppy.  Depth can be smoothed out with the Bias control when the Hard/Soft switch is set to Soft.

Speed also has a good range, although it probably goes faster at the max than is necessary.  The Half Speed switch option gives you a range of slower speeds and better control over them.  We do the Fast/Slow switch a little differently from the Supa Trem pedal,  Ours will tend to have a slightly lower max speed, although it seems unlikely anyone would use it near those max speeds anyway.  We've included a blinking Rate LED, too.

Bias changes from the Hard default wave shape to a range of smoother wave shapes when you have the Hard/Soft switch set to Soft.  This control isn't used when the Hard/Soft switch is set to Hard.  Setting the switch to Hard is the same as turning the Bias pot all the way one direction.

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