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: Evil Twin

Published: 20 April 2022 20 April 2022

 

 
 

Hello, Effects Fans!

Today we announce our new Evil Twin module.  It compares to the Lovetone Doppelganger.

Lovetone built a selection of outstanding, high quality boutique pedals in the small town of Henley-On-Thames from 1995 to around 2001.  During that time, they managed to set the pedal business on its ear with their imaginative designs sporting lots of controls.  Their Doppelganger was no exception.  At its heart is a 4-stage optical phaser.  What's unique is that the phasing is controlled by two separate LFO circuits, along with a variety of controls for the wave and tone.  There were two versions of the Doppelganger, the second adding an extra slow control and square wave control to LFO 1, along with a direct out jack.  Our GT Evil Twin compares to the second version of the Doppelganger.  It has the same great audio circuit, but with a few tweaks to simplify its usage and complexity without losing any of its sonic goodness.  The Doppelganger has been used by numerous artists including The Edge, Jimmy Page, members of Radio Head, Kirk Hammet, Johnny Marr of The Smiths, and others.  The originals were pricey for their time, and the low production quantities and their popularity make them pretty expensive, although not too difficult to find, today.

With the dual LFO design and numerous controls, the range of phaser/vibrato effects you can create defies description.  With the possible exception of when the Rates are set to their highest, almost every combination of settings could reasonably be used.  There aren't a lot of "spacey" or "seasick" settings to avoid.  It is tempting to describe most of the available tones as "subtle", but that's not quite right.  They can be very distinctive and obvious.  You won't get those extreme, over-the-top phasing sounds, or the jet whoosh, though.  It might fit in best with music that is slower and has some space between notes to allow this effect to shine - blues, country, ballads, folk, pop/classic rock, psychedelia ala Pink Floyd should all be great.  However, you'll need to carefully note your favorite settings so you can get them back.  For phasers, this one is pretty quiet as long as you don't allow too much noise into your input signal.  The sound is obviously going through some filters, but the result is very pleasant and "clean-sounding", giving you the feeling you are definitely playing a quality effect.  You can probably overload it and get some distortion - maybe you want to, maybe you don't - but it "plays warm and clean".  It's similar but different from a Univibe (our SwirlOVibe), but you might use it for the same types of music and in a similar manner.  A very cool and addictive effect, for sure.

While our Evil Twin gives you all the tonal options of the Doppelganger, we have made changes to some of the connection options to better fit into our rack-based line of modules.  Even after these changes, the Evil Twin is still one of our most complex and widest modules at 3" with a dozen or so controls.

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