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

 

Build Report: Supa Pi

Published: 30 September 2018 30 September 2018

 

 

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.