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.


Explore the Gerlt Technologies (GT) Site

  • GT Effects

This section of our site describes our product offerings in general terms.  In it you will find info such as:

What are the benefits of rack effects?  What are the specific benefits of Gerlt Technologies rack effects?

GT rack effects vs guitar pedals - How do they compare?

What are GT custom rack effects?  What types of customizations are offered?

How does GT rack effects power work?

How does GT rack effect switching work?

How does GT rack effect cabling work?

How is GT rack effect maintenance minimized and made easy?

How do you install and uninstall GT rack effects?

How does GT keep rack effect pricing low?

  • Products

Our products consist of Enclosures, Footswitches, and Modules that you select to create your complete rack effects setup.  A number of the common parts have been gathered together into Startup Bundles, with discounted pricing. 

As you navigate the menus, you will find full descriptions, configurations, options, pricing, and other details for all of our products.

  • Purchase

Since our products are all configured and built-to-order, we don't have a shopping cart approach to placing orders.  The process is much more consultative. 

  • More Info

This section includes extra info that may be helpful when you are selecting or configuring our products.  A little rough around the edges and still under construction

  • Support

This section includes all of our Customer Support policies, info about using our products, contact information, troubleshooting guides, etc.  Again, a little rough around the edges and still under construction.




Hello, Effects Fans!

Yikes!  We’ve been so busy working on new modules that we let some of our new product announcements slip.  It’s time to correct that oversight. 

Today we announce the Gerlt Technologies Chainsaw module.  It is an extreme high-gain distortion for the most brutal and heavy metal you can legally play in most countries.  If you like your metal Swedish style, then our HM-2 configuration may be what you want.  It compares to the original Made In Japan Boss HM-2 Heavy Metal pedal, a classic ingredient to that heavy Swedish death metal sound.  Add a humbucker guitar, a solid state amp, set all the knobs to 10, and you’re on your way.  Or if you prefer some American heavy metal, choose the FX56 configuration, which compares to the Made in the USA DOD FM-56 American Metal pedal.  The circuits are nearly the same.

The Boss HM-2 was produced from 1983 to 1991, first in Japan and later in Taiwan.  The two versions of the circuit are nearly identical, with some minor part changes.  The earlier MIJ models seem to be most popular, although it is difficult to tell the difference in sound between the ones made in Japan and Taiwan.  The HM-2 wasn't really all that popular, but you may remember that the heavy metal bands were just beginning to emerge around that time.  Somehow it caught on in Sweden, and suddenly the price of the older units jumped as players began buying them up for the heaviest of heavy metal tones.  It is often used with all controls set at max to get maximum distortion tones.

In 1984 US pedal company DOD released the FX56.  The FX56 circuit is basically the same as the HM-2, but some different part values were used and the Low and High controls were combined into a single Presence control, although it continued to use the unique tone stack design of the HM-2, but with slightly tweaked frequency ranges.  The FX56 goes from overdrive to distortion, although perhaps the level of distortion is a bit lower.  The Presence control goes from a subdued, compressed tone to bright and cutting.  With the controls turned up, you'll likely get out-of-control feedback and squealing.

Make no mistake, both configs are designed primarily for very high distortion metal tones.  But if you dial it down a bit, you may find your Iron Maiden, Judas Priest, and other British metal tones in there, too.  With all that gain, you’ll have loads of feedback and it may get into a squealing, out of control mess depending on your guitar, amp, and other gear.  If that happens, you know you have all the gain your rig can handle and you’ll likely need to take a little gain off somewhere to get it under control.  Of course that much gain means there is also an excellent opportunity for noise.  Gain will multiply noise just as easily as your guitar tone, as high-gain players well know.  You’ll probably want humbuckers and some sort of active noise management somewhere in your chain.

The interesting part of this circuit is the tone stack.  It is designed to help maintain some clarity with all that gain.  This is also where the two configurations differ most.  The HM-2 config has Lo and High “Color Mix” controls.  The Lo controls the low end like normal.  But the frequencies controlled by the Hi band adjust as you adjust the level of highs.  The FX56 config is similar, but the Lo and Hi controls are combined into a single Presence control.

We offer some customizations for both circuits, but if you’re looking at this module then you are probably after that heavy tone and you won’t need any options to get it.

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