Category: Modular

Rat King Modular GATES – DIY Build

Rat King Modular GATES - Eurorack Modular Build

As summer draws near and the hot weather rolls into California, it’s an optimal time to stay inside and catch up on some DIY modular kits.

When we heard that Rat King Modular was releasing a new module named GATES, we immediately hit up our friends at Synthrotek and ordered one up as soon as the kits were available. (The module had been released as a fully assembled version about a month prior and we were anxious to finally get our hands on the kit version).

Within a few days, the kit arrived and it was time to get busy building the Rat King Modular GATES!

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Completed Gates with Bag

Horstronic Cable Tester – DIY Build

Horstronic Cable Tester - DIY Build

As a DIY modular enthusiast, we are always looking for ways to help improve our efficiency when we are building modules. We recently ran into an issue where upon receiving a modular kit, the power cable wasn’t included. Now, this normally wasn’t a big deal, but it was rather annoying.

With that being said, we decided why not just make cables and sell them to our customers… so thats what we did. We knew that taking this on would be a fun endeavor and we needed to ensure that our cables were fully tested to protect modules from shorting. Finally after scouring the internet for a few hours, we came across the Horstronic Cable Tester.

Horstronic Kit Complete

After reading about the Horstronic Cable Tester over on the Muffs forum  we decided to order one up. There was only one problem though; there were none in stock anywhere. Stock notifications were signed up for everywhere so that we could order one up as soon as it arrived, somewhere.

A couple months had pass and then randomly we received an email that our friends over at SynthCube had a couple kits in stock…


Waveform Magazine PT2399 Delay – DIY Build

Waveform Magazine Project 1 - PT2399 Delay Module - DIY Build

When it was announced that there would be a magazine dedicated to modular synthesis, you can imagine the feedback from the modular community. Waveform Magazine was born in the summer of 2019 and upon its release it created a following.

To much of everyones surprise, not only was this a magazine that reviewed modules, manufacturers, artists, etc.. it also contained its very own DIY projects.

Project #1 was a upcycled karaoke reverb PCB that would be transformed into a eurorack delay. Otherwise known as the PT2399 Delay or Waveform Magazine Project #1, this little 5HP module inspired a whole new group of DIYers due to its new found glory of being published.

Waveform Magazine PT2399 Delay Module

PT23.. what?

At the heart of Waveform Magazine Project #1 is the PT2399 chip. The PT2399 is a CMOS echo/delay processor developed by Princeton Technology Corp.

This digital chip includes an ADC (Analog to Digital converter), 44Kb of RAM to store the samples and a DAC (Digital to Analog converter). This chip was created as a simple solution to add delay/reverb/echo to karaokes and set-up entertainment systems. Pretty rad eh?

The PT2399 is readily available and has a minimum delay of 30ms and a maximum of 340ms (that could be extended up to 1 second at the expense of sound quality) which makes it perfect for delay, echo and reverb effects.

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Eurorack Hardware (EH) Modules – DIY Builds

Eurorack Hardware (EH) Modules - DIY Builds

Spring is on its way and it is the perfect time for new modules to be hitting the market. We were stoked when the gang over at Synthrotek recently announced that they going to carry a new set of modules made by a relatively unknown company known as Eurorack Hardware (EH)

A total of 5 new modules in all, the OR, E-OR, ATT, AMIX and RING are going to make a splash on the modular scene.  With that being said, we are excited about taking on the new DIY Kits from Eurorack Hardware (EH). 

EH - 5 Modules Completed
Eurorack Hardware (EH) Module Line

Who is EH? Who makes these new modules?

Eurorack Hardware (EH) has actually been around awhile, you just kinda know them in a different persona. Have you ever heard of Division 6? What about the Dual Mini Sequencer? Eurorack Hardware (EH) was founded by Scott Rise, who is also is the director of Division 6 Labs. Division 6 manufactured the infamous Dual Mini Sequencer and they produce other synth circuits and video game hardware mods.

EH are mainly known for manufacturing hardware for eurorack modular systems. They specialize in various rails, brackets and screws, and pretty much anything you would need to build a custom rack.

Upon partnering with gang over at Synthrotek the world was introduced to the OR, E-OR, ATT, AMIX and the RING. The five modules are described below, each with their own time lapse build, build notes and gallery.

Let’s get one with the builds…


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