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!


I hope all is going well for you!

I’m back in the USA now, after a lengthy time away.  I’ve taken a bit of time to survey the post-post-COVID business climate and think about our next steps.   As is often the case, there are conflicting signals to sort through.  I won’t bore you with all the details.  The result is that I think the time is still not right to resume normal operations. 

One of the primary reasons is personal.  About a year ago I jumped into a really fun, non-work opportunity that took me out of the USA for most of the past year.  I will be out of the country again most of the coming year before things settle down to a new normal for me.  It’s a lot of fun, but wasn’t really part of any plan I had, so I need to adjust my plans.  I’m not able to operate Gerlt Technologies while I’m away, so the shutdown will continue for probably another year due to that until I can get my personal and professional plans realigned. 

Beyond that, the post- post-COVID situation is still unsettled.  I expected a period of ripple effects from COVID shutdowns, supply chain problems, and other world economic and political events that impact our business.  I’m starting to think those ripples aren’t going to die away and return us to something similar to the world we knew before 2020.  If some of those changes become permanent, much work and difficult decisions may be necessary.  At the moment, the parts I couldn’t obtain are now available, but some others are now unavailable.  Costs are both up and down for components, but shipping costs are now a large and growing portion of component cost and would probably force a general price increase, an action I’m very reluctant to take.  In a market that is difficult to read, it is difficult to justify additional investment.  As long as we remain cautious, we can continue to wait for time and change to bring about a better situation, even if it takes a while.

In the meantime, I will have some time to work on the less exciting “internal stuff” that is necessary to the process of building and delivering our products.  Our internal processes are a bit messy as a result of rapid product line growth, shutdown of some suppliers and vendors, and other reasons.  If we were to resume taking orders, these problems would quickly tangle up our operations.  So while we have “quiet time”, I’ll work to clean up some of those issues so we’ll be better positioned for the future.

I hope to also be doing some of the fun work, such as completing some new products, or at least moving them further along, and possibly some marketing events.  So keep an eye on us while we work through some of the issues that are holding us up at present.  I’m not sure exactly when I’ll return from my next sojourn, but it will likely be about this time next year when I pop up and take another look around to see how it looks.

Until next time,

Bill Gerlt

President, Gerlt Technologies

Dallas, Texas

21 June, 2023




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!