Hello Effects Fans!

Today there is good news and bad news.  I always like to end on a good note, so let’s get the bad news out of the way first.

The bad news is that Gerlt Technologies is going to stop accepting orders, effective immediately.  There are multiple reasons we need to stop, mostly related to the COVID shutdowns and their ripple effect through the economy.  While there’s never a good time for a pandemic, it caught us at a particularly awkward time early in 2020 - no complaints, just a fact.  I thought we could continue as planned, but it just isn’t working out in spite of our hard work and best intentions.  We reached a point where we risk doing ourselves more harm than good.  It’s time for a break.

The good news is that we are stopping now so that we can return later.  This will be a temporary halt until the COVID situation is resolved and the economy improves.  Then we expect to be right back in the thick of it, building the widest variety of the best rack effects available anywhere!  We have no debt, no landlord demanding payment, or any of the usual financial pressures many small businesses are experiencing right now.  We have a good stock of great parts waiting to be turned into great effects so you can make great music.  We’re in good shape that way, which makes a “pause” and “resume” possible.  I can’t predict the duration of the pause at this point.  I expect it will take some time before COVID impacts will be behind us and a full-strength economy ahead of us.  Other small businesses, including some of our partners, have used this approach to protect their businesses from permanent shutdowns.

We have quite a bit of work in progress.  Over the next weeks you will continue to see additional product announcements and updates, as we finish those ongoing activities.  Keep an eye on our Facebook page and website for continued updates.  Customer Support will still be available, but there may be some delays.  Your messages will not be ignored and we will respond as quickly as we are able.

We know that many of you have also been impacted by COVID and our thoughts are with you.  We wish all of you, your friends, and your families the best during these trying times and look forward to the opportunity of serving you in the future.


Bill Gerlt

President, Gerlt Technologies

31 January, 2021




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.






Hello, Effects Fans!

This has been "on the way" for some time, and we're happy to finally announce the availability of our new Sweeper flanger module.

The Sweeper compares to the A/DA Flanger.  The original A/DA Flanger was released in the 1970's.  It has gone through several revisions and sometimes been out of production, but is again in production today.  The circuit remained largely unchanged, although availability of different BBD analog delay chips forced minor changes to accommodate the different chips.  Originally, Reticon chips were used, then various Panasonic BBDs, as can be found in the current models.  Regardless of the model or BBD, the A/DA Flanger has retained its character and high quality through the years.  Every version released has been excellent.

Despite its long history and high quality, the A/DA Flanger is probably not the best-known flanger, probably because it costs more than other popular flangers.  But those that have spent the extra cash will find a unique wide sweep range and a rich set of controls that provide a wide variety of flanger and chorus-like tones.  It also has another feature that sets it apart from the others - little to no "flanger noise".  You know that extra swooshing sound most flangers (and phasers) produce which can be very noticeable in quiet passages and during rests.  This circuit is engineered to remove nearly all of that without hacking out chunks of your signal along with it.  There are other good flangers, but once you find a quiet flanger it can be difficult to go back...

The Sweeper stays pretty close to the original design.  Of course, our power and switching are very different, but those don't have any audible impact on the sound.  We use the MN3007 BBD, as was used in some versions of the pedal.  The circuit has a number of controls, some of which were internal trimmers or external controls in different versions.  We've made most of those external controls.  There are still some internal trimmers, but those aren't meant to be adjusted after their initial calibration.  We also offer an option to use an expression pedal.  The pedal takes over the function of the Manual control and lets you control the sweep.  We don't (yet) offer an expression pedal, but third party expression pedals will work.  The Manual control is a "B10K" pot, or a "10K linear" pot.  An expression pedal with a 10K linear pot makes a great direct replacement.  Expression pedals with other values may only sound good in a portion of their range.

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