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: Crema Boost

Published: 30 September 2018 30 September 2018

 

 

We recently added an option to our FlexBoost board.  That board is used to build several of our boosts, including Trail Boss, Queen Boost, Treble Boost, Sonic Boom, Bass Boost, Woody, and others.  The option allows us to add a simple Tone control to some of those other boosts.  The Tone control option is nice, and enables us to offer our Crema Boost, which compares to the Keeley Java Boost.  We have now added the Crema Boost to our product list.

We just built a Crema Boost on our new boards.  It was a standard build, with no extra features.  We did use an OC42 transistor instead of an OC44 in our test build.  We had both available, but we decided to go with the OC42 in our demo module so people could try out another transistor type.  The Crema Boost is very similar to the Trail Boss, which compares to the Dallas Rangemaster.  We already had some OC44 builds of the Rangemaster in our demo racks.  If you play our demo modules, you could compare the two transistor types in those similar modules.  There’s not much difference between the two when the transistors have both been selected carefully. 

The Dallas Rangemaster was a treble boost designed to brighten up a Les Paul paired with a Marshall amp.  It was particularly intended to push a Marshall tube amp into distortion.  If you use it at lower amp levels, or with a brighter setup, it won’t sound so great.  The Crema Boost has a switch to allow you to select between a full range boost, treble boost, or mids boost, which makes the module sound better when you aren’t playing through a Marshall on the edge.  Crema is the smooth, rich, tan foam on your espresso that gives it its character and makes it more than just some strong coffee.  The Crema Boost does something similar for your Les Paul and Marshall clean tone on the edge of breakup.  Or with the flick of a switch, it works for a different guitar/amp combination.

We’ve compared our Crema Boost to the Java Boost in our test pedals collection.  Although the transistors are different types, with probably different gains and leakages, and probably different biasing, the two sound about as close to the same as two germanium circuits can.  Grab your Les Paul and your Bluesbreaker amp and get your Clapton Beano tone going!