Tag: modularsynth

Waveform Magazine Meow Mixer (Project 6) – DIY Build

Waveform Magazine Meow Mixer - DIY Build

Completed Meow Mixer - Front

Every quarter we receive a new issue of our favorite magazine… Waveform. In this issue (Summer 2021 – Issue 6), a small 2HP module called the “Meow Mixer” was featured alongside a new modular case kit (aka. The Mewsic Box) as the featured project. The Meow Mixer is a 3-channel powered Eurorack module that has 3 inputs with attenuation, and 1 summed main output with an output volume control.

As with every DIY project that Waveform Magazine releases, the Meow Mixer was unique in that it could be used in conjunction with other DIY projects that Waveform released. This sounds confusing we know … but stick with us on this build and we will explain everything in detail. So, without further ado, let’s jump right into the build of the Waveform Magazine Meow Mixer!


Reverse Landfill Monotropa V3 – DIY Build

Reverse Landfill Monotropa v3 - DIY Build

When it comes to unique and must have modules for our rack, Reverse Landfill is one of the top manufacturers on our list. This month, we are following up our Aconitum Noise Mixer build with another Reverse Landfill aptly called the Monotropa.

This diy module one of the Monotropa’s currently being offered by Martijn. The other version of the Monotropa is known as the Monotropa II or mk2 and is also available via the Reverse Landfill ETSY shop.

Reverse Landfill Logo
Monotropa - Completed Front

At its core the Reverse Landfill Monotropa is a feedback EQ distortion module or basically a bad ass mother f*cker. It consists of 4 pots for frequency volume, 1 pot for feedback amount and 1 pot for gain amount. Since this kit is the 3rd version of the original Monotropa, several revisions to the layout and panel have also been updated. These are subtle differences but they make one hell of an impact.

To sum up this module, it can make any sound bigger, add bass, mids and highs with resonant qualities. In other words, it can completely destroy your beats and percussion which is EXACTLY what we were looking for. Would this module be love at first patch? Let’s see… 

Links and more links…

Below are a series of links that have been provided by Reverse Landfill to help assist with the use, building and patching of the Monotropa v3.

If you are building an older version of the Monotropa, you will have use this link to see all of the versions previous to and including the v3 (this build).


Reverse Landfill Aconitum Noise Mixer – DIY Build

Reverse Landfill Aconitum Noise Mixer - DIY Build

We are HUGE fans of Reverse Landfill and their modules and we were lucky enough to pick up the Aconitum CV mixer module prior to it being discontinued. This noise mixer module has 3 types of analog noise which include white and 2 colored typed with adjustable bass and treble knobs.

The noise outputs are also normalized to the volume knobs and if nothing is patched in, these outputs control the noise volume. At only 8HP, the Reverse Landfill Aconitum Noise Mixer was our first build of 2021. 

Reverse Landfill Logo
Completed Aconitum

As with any Reverse Landfill module, Martijn (the owner) provides excellent documentation via his website. You can download the Aconitum V2 Build files here or on the main Reverse Landfill website. After you download the build files, it is important to read the BOM carefully. There are no fancy graphics showing components so you will want to make sure you know how to read a BOM.

If you don’t know how to read a BOM, you might want to go ahead and turn away. Martijn’s modules are for the intermediate to advanced builders and novices will want to take a backseat on these until they have a little more experience. Now, enough with all of the intro stuff… you know how we do this… on with the build!!

Resistors and Capacitors...

First up are the resistors. The resistors are all individually labeled so it is easy to see what is what. If you are unsure, either use a component tester or a multimeter to test the values of the resistors. There are 22 resistors total and placing them is quick and easy. We used top down soldering on the resistors to help speed up the process of tacking things down……


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:


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