Category: Build

Rat King Modular TONE – DIY Build

Rat King Modular TONE - Eurorack Modular Build

Tone DIY Kit

For our first build of September, we were honored to receive one of the first Rat King Modular TONE kits from our friends over at Synthrotek

A relative newcomer to the Eurorack Modular scene, the Rat King is quickly proving to be a master of modular synths. Being the third module in the series, we have to say that the TONE module pairs well with its brethren kin; the EVENT and the Random SEQ

So, what makes the Rat King Modular TONE different from other VCOs?  Well, besides the beautiful mustard gold PCB and the matte black panel with gold laced graphics, the TONE uses the Alfa AS3340 chip (a CEM clone), made famous by its outstanding quality.  It is hard to go without saying that this VCO has some grit and some warm sounds that are trackable over an entire 8 octaves. 

Let’s get onto the build … All Hail The Rat King! 


Synthrotek M/DIV – DIY Build

Synthrotek M/DIV Eurorack Modular Build

Completed MDIV Module

For our final build of the summer, we take on the Synthrotek M/DIV Eurorack Module. This module is apart of the “slider series” developed by Synthrotek and has the ability to multiply or divide clock signals with a quick slide. What sets this utility module apart from other similar modules is that the M/DIV can do both (multiply and divide) due to its dual clock channels. It also has a master clock out bringing the total outputs to 3.

The M/DIV also contains a clock reset input and a “tap” tempo button to help your performance reach new heights. The sliders that Synthrotek uses are reactive and contain a small LED that easily gives you an idea of what is going on with your clock signals.

MDIV or M/DIV?

So you may have noticed the spelling the M/DIV on the packaging or have read related media that shows it being spelled in other ways (MDIV or M-DIV).  The correct spelling of the module is “M/DIV” and for our purposes here, we will also refer to it as the M/DIV instead of any other way of spelling.

Let’s get onto the build …


Limaflo MotoMouth – DIY Build

Limaflo MotoMouth Eurorack Module - DIY Build

Completed MotoMouth Module Front View

As the summer is ticks along, we decided to take on a relatively new module. The LimaFlo MotoMouth Formant Filter. MotoMouth was originally a Kickstarter project that was first launched in March of 2017, and thanks to its backers, the MotoMouth was born. Our buddies over at Synthrotek were one of the first to have the DIY kits and you better believe we had to get our hands on this one and line it up for our final July build. 

Before we get into the build notes, videos and audio samples, you are probably wondering what in the world that the MotoMouth does. The Motomouth is described as an analogue 3-Band, Sedra + Espinoza Bandpass Filter (DABP) with resonant frequencies that are tuned to the same resonant frequencies that are found in the human mouth and nose cavities.

These frequencies can be varied, independently, to form different ‘mouth shapes’, to emulate vowels such as A, E, I, O and U.  In the end, this module can essentially emulate 16 vowels and ‘morph’ or ‘glide’ between each vowel using a single Control Voltage input (1V/Oct), and a Gate to ‘snap’ to each vowel when required. 


Rat King Modular SEQ (Random Sequencer) – DIY Build

RK Random Sequencer (SEQ) Modular Build

Rat King Modular SEQ DIY Kit

For our first build of July, we take on the Rat King Modular Random Sequencer (or SEQ as it’s known). This build is hot on the tails (no pun intended!) of the EVENT that we completed last month and we have to admit it . . . it was just as fun to build as the EVENT.

The Random SEQ panel and PCB are laid out similarly to the EVENT with its matte black panel and mustard yellow PCB. The blue hue from the LED below the panel appears frosted as the LED is not a panel through mount.

One might question how many more modules the Rat King will make… all we can hope for is a lot more!

As for the build itself, it was a quick and easy build for the advanced or intermediate builder lasting only about an hour. For the novice builders, this is a great one to get your feet wet with as the BOM and quick setup instructions (provided with the kit or available online) allow for easy reading. 


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