Gerlt Technologies makes hundreds of customizable rack effects, at prices comparable to regular 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.








The Virago – RTO configuration was added to our product list recently.  The Virago - RTO configuration compares to the Fulltone Robin Trower Overdrive.  The circuit is very similar to the standard Tube Screamer circuit, but with a few changes, including:

  • No input buffer
  • Switch from 4558D to LF353 JFET op amp
  • Switch to asymmetric MOSFET clipping
  •  There is a lower minimum drive level and a higher maximum drive level
  • It has our Virago Tone Modification option as standard.  It provides a bit wider range of adjustment, with a little better control over the highs.

The changes give the circuit a wider range of Drive and Tone control.  The op amp and clipping changes are meant to result in a more “tube-y” sound.  Both as compared to a TS-9 Tube Screamer. 

In our build, we stuck with the stock Virago – RTO circuit, but added a clipping option.  Red LEDs work nicely in overdrive clipping circuits, so we couldn’t resist adding that as an option.

Our Virago - RTO and the original pedal sounded nearly identical.  There were three noticeable differences.  The original pedal is a smidge louder at max volume.  If you crank all the controls to the max, the original pedal starts screaming and oscillating.  Our module doesn't do that.  Finally, our module has a bit more treble when the Tone is set all the way to the treble side.  Otherwise, the two sound very similar.  The original seems a bit dark, so the extra treble in our module turns out to be a nice difference.  Switching to LED clipping diodes in our module provides a bit more highs, a bit more volume, and a more open sound.  The change isn't huge, but it is definitely there and provides a bit more flexibility.