To avoid any confusion:

The concept of the knob made of concrete is fully inspired by DIY Perks. But we are added a lot of perks, like:

- Open-source Arduino-compatible firmware so you can add your functionalities and light effects;

- The audio is controlled with the HID library instead of potentiometer; spare time - There are one audio input and two outputs that can be switched with the hardware switch;

- Bonus option is you can use it as a scrolling knob;

- The audio lines are connected to the microcontroller and you can add light effects relative to the sound;

- It is 3d printed and we also added a 3d printable model of the mold for the concrete part;

Have a nice day ;)