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!

In my last update I was excited after finding some small quantities of critical components that are needed to build our effects. I hoped that to be a sign that perhaps some of our supply chain problems were easing. But it seems those were just one-off lucky finds. I haven’t found any more since then. On top of all the other problems, we now have the ripple effect of the conflict in the Ukraine, which has caused even more parts to become unavailable and/or very expensive.

It’s one thing to be optimistic, but another to be unrealistic. This is no longer a time for simple optimism. It is a time for handling unpleasant realities. Our reality is that it seems very unlikely that enough positive changes will occur quickly enough for us to re-open in 2022. While the corporation is in a good position to weather a continued lengthy shutdown, the people are not able to. We need to take some time to go do “other stuff” for a while.

We still have several new modules to announce. The work is complete on almost all of them, so I’ll try to get those announcements out in April and May. Other than that, I’m afraid it is going to be pretty quiet here until we are able to reliably source parts at reasonable prices again. I probably won’t have another update until late summer or into autumn.

The good news is that Gerlt Technologies is still here and alive. We haven’t “lost” anything. We still have the largest selection of rack effects available, getting close to 400. Our effects still sound great. And we still want to make them available to you. We’re just going to have to continue our break for a while until the business and economic conditions improve to the point that we can provide outstanding products and support at affordable prices.

I apologize for the continued delay and will do everything I can to get us going again as soon as it becomes feasible.



Bill Gerlt

President, Gerlt Technologies

Dallas, Texas

11 April, 2022




Hello, Effects Fans!

Today we announce our new InAGaddaDaFuzza module.  It compares to the Mosrite FUZZrite and the recently-released Catalinbread FUZZrite.  

There were a number of new fuzz pedals hitting the market in the 60's.  The Mosrite FUZZrite was one of them.  It's a little difficult to say with certainty who used what fuzz back then, but it seems fairly certain it was the fuzz used for Iron Butterfly's multi-platinum In-A-Gadda-Da-Vida.  It probably wasn't used by the Ventures, although it probably does give you the sound they were looking for at the time.  It probably was not used for Spirit In The Sky either, but it gives you a similar fuzz character - a little nasty and gnarly, a bit low-fi, maybe good for garage punk.  But with some fiddling about, you may find that fuzz sound heard on a number of 60's bands, particularly those in California at the time.  Recently, Catalinbread worked with the Moseley family of the original creators to build a reissue of the FUZZrite.  It compares well to the original.

The earliest versions of the FUZZrite used germanium transistors, while later versions were silicon.  You get a similar fuzz tone from both germanium and silicon transistors, or even a mixture of the two.  However, the germanium versions seem to sizzle and gate out, maybe just what you're looking for, maybe not.  In our opinion, silicon transistors are the way to go.  We have the same uncommon transistors used in the Catalinbread remake, or we can use something else if you have a preference.  Either way, it's a rude, in-yo-face, stick-it-to-the-man fuzz, a bit like the Gibson FZ-1 used by Keith for Satisfaction a few years before the Butterfly took wing.

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