LEET Control8

The Control8 MIDI unit is part of the LEET Synthesizer project. If you haven’t – It is a good idea to read the main post first before continuing with the details below:

This post describes how the Control8 unit works and what you need to build your own.

Description of the Control8 unit

Product guide. Click here to download high-resolution PDF.

Part list:

  • 1x 3D printed core 3DPCB
  • 8x 3D printed potentiometer knobs (use the version with 0 deg arrow)
  • 1x Arduino pro micro, or compatible clone (5V version. ATmega32U4)
  • WS2812 LED-strip with 8 LEDs (60 LEDs/m. I used IP60, white FPC)
  • 8x 100k trim-potentiometers (10k-500k will work)
  • 1x 25cm RK wire (containing 24 strands of 0.3mm copper wires)


  • 3D printer (FFF/FDM with PLA filament)
  • Solder station with a narrow tip
  • Basic tools: Needle- and cutting pliers, knife, hot-glue
  • Computer to run Arduino IDE and upload firmware (using a Micro USB cable)


The Control8 is the successor to LEET Control.

Control8 has 8 analog inputs and uses the same low-cost trim-potentiometers as LEET Chord and Sequencer. In order to simplify routing, the trim-pots are rotated 90 deg compared to the other devices – so make sure to use the right 3D printed top if you want the arrow to face upward in mid position.
I recorded the process when I designed the 3DPCB for the device if anyone is interested:

Designing a 3DPCB in 10x speed (still boring unless you want to learn how it is done ;)

Build it

I have not made a step by step building instruction, but if you have built another device, it should be sufficient to look at the illustration below. The build process is very similar to the step-by-step instruction for the keyboard.

Backside view showing routing of wires.

Don’t forget to share your build in the forum. The forum is also the best place to share ideas, assist with development and  get support and help other LEET builders

Download project files

All files required for this project are available at this GitHub repository:


This project is open source under MIT License
(Attribution is optional, but appreciated /Johan von Konow ;)

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