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 VibeKing module.  It compares to the Boss VB-2 Vibrato.

The Roland Jazz Chorus JC-120 amp provides an iconic clean amp tone, along with built in chorus, reverb, and vibrato.  It is still in production with an unchanged design since its introduction in the 70's.  In 1982 Roland/Boss introduced the VB-2 Vibrato pedal, which captures the vibrato of the JC-120 amp in pedal form.  The pedal didn't sell well.  It may have taken 4 years just to sell off their initial production run.  In 1986, it was removed from the market.  It was one of the least popular of all Boss pedals.  Of course, rarity can make something more desirable in the market.  Over the years, the price of those original VB-2 pedals began to climb.  They are still expensive, but not quite so rare as they once were.  

So what's all the fuss about?  The VB-2 used some of those famous Panasonic BBD chips to create that great analog vibrato.  It is also a well-designed circuit, producing a very pleasant tone.  Rate and Depth controls provide the standard modulation controls, going from subtle to over-the-top, much like those 80's chorus pedals.  It also had two modes of operation.  In latched mode, the effect is on when you turn it on with the footswitch, and stays on until you switch it off - just like a normal pedal.  In unlatched mode, the effect is on only while you hold the footswitch down.  That allow you to use it to add vibrato to individual notes or chords, much like you would with your hands.  A Rise Time control lets you decide how fast the effect "spins up" from off to full speed (as set by the Rate control). That spin up time is pretty short, even when at the max, making adjustments with Rise Time very subtle. 

At any rate, the popularity grew and Boss finally put it back into production from their Waza custom shop, creating the VB-2W Vibrato.  It is a great remake of the classic VB-2 pedal.  It adds a switch to select the original or a new custom voicing.  The difference between the two is difficult to hear unless you listen carefully for it.  The VB-2W does not use the same Panasonic BBD chips as the original.  The original used Panasonic MN3207/MN3102 BBD/clock chips.  The VB-2W uses the CoolAudio V3207D/V3102D pair instead.  The CoolAudio chips are "work alike" chips, but to our ear they aren't quite the same as the original Panasonic chips.  Our VB-2W pedal has some distortion and clipping in the delay path with humbuckers, especially when you have your guitar volume up and/or are digging in.  A gentle touch or lower output pickups are cleaner.  Of course, YMMV.  The original had the Boss always-on buffer in the signal path even when the effect was off.

That's pretty much the VB-2.  It's a great vibrato effect.  Perhaps vibrato isn't the most popular effect.  Obviously, you can create vibrato with your fret hand, no effect needed.  Or you can use a whammy bar (called a "tremolo bar" by many).  You can use the unlatched mode of the VB-2 in those ways.  Another interesting use of vibrato is to give a bit of "movement" to your tone.  In this case, you set the vibrato low and slow so that it is hardly noticeable.  You can do this same trick with chorus, tremolo, and delays.  It tends to fatten up the tone and give it a little something-something to make it more interesting.  Or you can use it sparingly, but more prominently to get a psychedelic, spacey effect, like in Lucy In The Sky With Diamonds.

Our Vibe King compares to the original Boss VB-2 Vibrato, and is built using the same great Panasonic BBD and clock chips.  Ours is "off when it is off", not forcing your tone through a portion of the circuit or a buffer.  

This circuit turned out really well.  It's easy to see why it is the "Vibe King".  All the standard and optional controls work simply, as you expect. Rate and Depth controls are standard, along with Rise Time for "Unlatched Mode".  You can choose how you want the switching modes (latched vs unlatched) to work.

Depending on your setting for the optional (recommended) Delay control, you can get either a dry or very lush effect.  There is an internal Bias trimmer.  It is preset, as there is a very narrow range of settings for it that allow the effect to function.  When it is properly set, the circuit is nearly completely noise-free with the Panasonic chips.  It should also be at or near unity volume.  If you hear a little noise or you are off unity volume a smidge, you can tweak the BIAS trimmer.  Just set it where it sounds best.

Even if you aren't normally a big fan of vibrato, you may find the VibeKing a bit addictive.  You can set it shallow and slow and leave it on all the time to add a little movement to your tone.  Or use it in unlatched mode, where the effect  is controlled by a momentary footswitch to add some "big bends" here and there as you play.  When you are "unlatched", the Rise Time control adjusts how quickly the effect "spins up".  At one extreme, it is pretty much instantaneous, while at the other extreme there is a noticeable change up, emulating a rotary speaker's spin up time.

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