Tag: VCA

Waveform Magazine Catwalk LPG/VCA – DIY Build

Waveform Magazine Catwalk Cattenuator - DIY Build

As we tackled the Waveform Magazine Cattenuator, it was now time to tackle the new LPG/VCA. Like the previous build and the Mini Mult Catwalk, these modules take up about 12HP of space in your rack. Their footprint is small and their impact is huge. As previously stated, Waveform Magazine is on point with their Catwalk series. In case you have missed any of the previous builds or reviews, check out the quick links below to learn more.

Project #5 - Catwalk LPG and VCA

Let’s get onto the builds shall we? Building the Catwalk VCA or the Catwalk LPG is relatively easy. The most difficult part of this build is assembling the vactrol or optocoupler as its sometimes called. An opto-isolator (also called an optocoupler, photocoupler, or optical isolator) is an electronic component that transfers electrical signals between two isolated circuits by using light. 

You will be putting together 2 of the optocouplers for this set of Catwalks, so turn on your iron and get ready to dive right in. 

Quick Links:


Waveform Magazine Cattenuator – DIY Build

Waveform Magazine Catwalk Cattenuator - DIY Build

Issue #5 of Waveform Magazine is hot off the press and is steaming with all sorts of amazing modular goodness. With its reviews, interviews, industry news and modular kits, it is no wonder that so many modular enthusiasts look forward to each issue.

Since the magazines first release, we have been building the WF kits as soon as we get our hands on them. Here are the previous projects that Waveform has released and we have had the opportunity to build/review.

Issue/Project #1: PT2399 Delay

Issue/Project #2: The Gateway Oscilloscope 

Issue/Project #3: The Switchenator 

Issue/Project #4: Catwalk – Mult, Mini Mult and Ribbon 

Project #5 - Cattenuator!

As with all of the previous builds, the quality and the ingenuity continues to get better and better. Waveform really threw everyone for a shocker with their “Catwalk” series from Issue #4, being that neither of the projects took up any space in ones rack (hence the name “catwalk”).

Issue #5 is no different and we are fortunate to have another x3 Catwalk modules (actually 4, the Catwalk Attenuator contains x2 of the same modules). With all that being said and done, let us get on with the builds so you too can see how cool these new Catwalk modules are! If you would like to bypass and jump to a specific Catwalk module, use the quick links below.


Division 6 CEM3340 VCO – DIY Build

Division 6 CEM3340 VCO - DIY Build

Completed CEM3340 Front

Summer is in full swing and we were craving some new oscillators to add to our modular rack. This need was fulfilled by Division 6 labs and Synthrotek with the new Division 6 CEM3340 VCO.

This voltage control oscillator is based off the famous Curtis 3340 IC which has been around for quite some time and have been utilized in many legacy synths.  Our build of the Division 6 CEM3340 was a quick and easy build and is recommended for anyone just getting into modular DIY. 

What is the Curtis 3340 IC?

Many synths today utilize chips that mimic the famous Curtis 3340. While this chip is no longer manufactured in mass volume, there is a few places that still sell the chip. What makes this chip so special is it is a self contained, precision voltage controlled oscillator. 

NoteThe chip used in this kit is not an original Curtis 3340 IC, but it’s damn close!  

It features both exponential and linear control scales and up to four buffered output waveforms. ( triangle, sawtooth, square and pulse). They do not require a temperature compensation resistor because they provide their own compensation. Multiple control voltages can be mixed within itself.  


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

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