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Synthrotek ADSR – DIY Build

Synthrotek ADSR - DIY Build

For our latest build, we take on the new Synthrotek ADSR. This ADSR is a small (only 4HP) and simple envelope generator that has a CV additive available in its ADR stages giving it a unique controllability that few ADSR modules have.

It is well known that as one dives deeper into the world of modular synthesis, it becomes apparent that certain types of modules are needed to compose dynamic sound. ADSRs can dynamically change the “movement” of sound due to its ability to alter parts of the sound waves. 

Before we jump into the build, we have to state one thing.An ADSR is a must for any modular artist, and the Synthrotek ADSR is an excellent choice!

What is an ADSR?

By definition, ADSR stands for Attack, Decay, Sustain, Release. It’s a must-know concept for all types of music production and sound design. Together, they make up the ADSR envelope which can alter the shape and sound of audio giving you dynamic music.

This concept of ADSR applies to all sound no matter what kind of source you’re using. ADSR controls are most commonly found on VST synths, hardware synths and samplers. Now, enough with the jargon, lets get on with the latest build… 


Synthrotek RND – DIY Build

Synthrotek RND - DIY Build

The Synthrotek RND (Random) is a 4HP random voltage generator that is part of the slider series from Synthrotek. With its ambient LED sliders and black panel, the module is a perfect fit for anyone trying to toss a little spice into their tracks. 

RND carries its own internal clock or it can be patched by an external clock, giving the user a varying degree of control with regard to tempo. Apart from this, it also has a CV (control voltage) of the clock, so that your random voltages will always be in sync with whatever you patch into it. 

Sounds cool huh? We thought so too and now let’s get on with the build. 

Let's start with the logic board...

Like the other modules in the slider series, the Synthrotek RND is a relatively quick and easy build thanks to the detailed assembly instructions that are provided via the Synthrotek website. As we jump into the build, we start with the diodes and resistors. Since there are only a few of each, we placed everything prior to tacking it down.

We did use top down soldering on all of the resistors and diodes since there was plenty of room to get your iron into the soldering points. Once this was complete, we flipped the PCB over and trimmed the leads. This is a good spot to double check the flow of solder and reflow anything that needs it. 


Synthrotek FOLD – DIY Build

Synthrotek FOLD - DIY Build

As 2020 comes to a close, we wanted to finish up one more build. The guys over at Synthrotek sent over their new FOLD module, which is a dual function module in eurorack format. The FOLD is one part ring modulator and other part wave folder that can take both audio or CV sources. The FOLD is available as a fully assembled module, a PCB/Panel combo or the DIY Kit that we will be reviewing and building here. 

Synthrotek Logo

On with the build ... The Logic Board

First up are the resistors and there are a lot of them. While they are non-polar (direction doesn’t matter), its important to make sure you are identifying the resistors correctly. Synthrotek did a great job with their visual BOM as it shows exactly what component goes to what area on the PCB. They also have a cool resistor band identification tool that you can download here. 

There are 47 resistors and that means take your time when identifying and placing them. When we were unsure, we used our component tester that we have in the shop. Once identified, we placed them into the PCB and lined everything up to solder. We used a top-down soldering technique which kept us from us having to flip the board over and over. When we were done with the top section, we flipped the board and reflowed solder so that our solder points were perfectly placed. 


Division 6 – Dual Mini Sequencer Panel and IC Update!

Division 6 Dual Mini Sequencer V2 Update

Dual Mini Sequencer V2 Kit

The Division 6 Dual Mini Sequencer has been an integral part of many of our compositions. This module gives you two handy sequencers in one small footprint.

Comprised of two independent sequencers (one on top and one on bottom), the Division 6 Dual Mini sequencer can not only play the notes, but it can transpose them as well.

This module can be utilized as a clock module and it can be ran in parallel for multiple CVs and/or triggers.

Not only can this module do all of these things, it can also be daisy chained to another Mini Sequencer to add even more steps in your sequence. 

Being that the Dual Mini Sequencer has been out for awhile, we were surprised when it was updated out of the blue. What else could make this module better we thought? Well, here is just a list of some of the new updates:

  • Multiple sequence memories 
  • Songs – you can string together sequences (this is rad)
  • 5 song memories (you can string sequences together)
  • Live transpose 
  • SLUR – the ability to change the CV OUT to a new note but still doesn’t fire the gate
  • 16 different gate timings (including 3 ratchet)
  • ACC can be programmed with 3 different modes to choose from (on, on with drop and gate follow)
  • Ability to copy a song or sequence
  • More speed choices with internal clock
  • RESET button integration with various modes
  • 1x and Live Edit Modes
  • Updates to clock out and Change on Clock mode

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