Category: Review

Waveform Magazine Catwalk – DIY Builds

Waveform Magazine Project 4 - Calkwalk - DIY Build

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Catwalk - Project 4 - Arrival

As the latest Waveform Magazine hit both the digital and home mailboxes, we were anxious to see the gang had come up with for their latest DIY module. We had the opportunity to build, review and share all of the previous Waveform Magazine projects in previous months and needless to say our curiosity was struck by the new packaging of Project 3 – The Switchenator.

As you can see in our Switchenator build photos, the header card/packaging of the module listed all 3 of the previous projects (PT2399 Delay, Gateway Oscillator and The Switchenator)… but the card had another listing. What could the Catwalk be? Was the Catwalk the notorious “Project 4”? Could this be a clue to the next module or DIY project this amazing magazine has developed? The simple answer is yes! Ladies and gentlemen, Waveform Magazine has presented us with Project 4 – The Catwalk.

The Catwalk? What the?….


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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