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 a 1979 Sola / Colorsound Supa Tonebender to our collection of testing pedals.  The Supa Tonebender circuit is unrelated to any of the regular Tonebender circuits.  It is actually a Big Muff Pi with a couple of mods.  The main mod is that the first set of clipping diodes was left out.  It’s thick and fuzzy, one of our favorite versions of the Big Muff Pi.

We wanted to compare it to a Supa Pi module we built to our standard spec for that configuration.  We didn’t add any options.

How does our module compare to the original?  Quite well, thank you!  Our normal test includes A/B testing at the extreme settings of all the controls.  In the extreme settings, we can’t tell them apart when we A/B them.  Saying that another way, the controls all have the same range of effect, from low to high (Volume, Tone, Sustain).  However, there are slight differences in the potentiometers.  If you want to match settings between the original pedal and our module, you can match them but the knobs may be on slightly different settings.  The base tone and the nature of the fuzz are as close to the same as two original pedals are likely to be.

Actually, our Supa Pi module sounds just a little bit better to us than the original, since it costs a few hundred dollars less!  The original pedal only takes battery power.  The battery clip has already been replaced, and needs to be replaced again because it is shorting out.  Our original also has scratchy pots that cut in and out and need to be replaced.  We tried cleaning them, but they are worn.  Once set, they work fine, but it’s a little tricky to adjust them.  If we replace them, the value of the pedal would probably drop considerably, even though it would sound better.  Of course, that isn’t an issue with the new pots on our module.  If, years from now, they are worn down like the ones on our original, we would simply unplug them and swap them for new ones – no problem!  The old Sola / Colorsound pedals are also large and take up quite a bit of space – not very pedal board friendly.  And it has some surface rust marring the chrome finish and the knobs are a bit beaten up. 

In the end, we paid several hundred dollars for an original 1979 Supa Tonebender.  It is bulky, rusty, and only takes battery power.  It needs a new battery clip and pots replaced.  That wouldn’t cost us much to do, but we’d would lose a considerable amount in resale value if we did it.  Or for about one third the cost we could get a brand new Supa Pi module that sounds the same.  Easy choice.