ADDAC System Launches Expression Control and Servo Controller, Ushering in a New Era of Creative Control for Musicians

Lisbon, Portugal, December 22, 2025 — ADDAC System announces two new powerful new tools to help musicians foster greater creative control: the Expression Control and Servo Controller. Both products, which are suitable for guitarists, synthesists, and any other knob-turning musicians, are available now.

Expression Control: ergonomic and responsive
​With the advent of MIDI, expression pedals have become a powerful means of controlling creative output when one's hands are otherwise occupied. They are simple and effective way ​ to achieve extended control, and are both ergonomic and responsive. Having one's feet controlling different parameters not only liberates the hands, but allows a new dimension of shaping creative outcomes.

Over the years, ADDAC System has unveiled several Eurorack modules making use of expression pedals, but now the company introduces a standalone plug n’play MIDI controller specifically designed for TRS-based. It allows no less than 8 expression pedals to be connected simultaneously, and outputs Control Change messages via either USB-C MIDI, Bluetooth MIDI or standard DIN5 3.5mm jack. As such, it can connect to any synth, computer, tablet or phone making it an enormously flexible creative tool.

Servo Controller: ingenuity and great engineering
​In parallel, the new ADDAC System Servo Controller has been inspired by Neil Young’s Whizzer - which was way ahead of it’s time and a great example of how great ingenuity and engineering can converge. The Servo Controller motor system has been developed by ADDAC as a standalone solution, featuring 8 Servo outputs to control any knob on any amplifier, guitar pedal, rack gear, or other piece of equipment.

"The idea behind our Servo Controller was to create a device that would open the possibility to control any knob, any physical knob, be it from a musical device or any other tech appliance that needs to be controlled," says André Gonçalves of ADDAC System. "Our solution comes with a Servo Connector that screws into any compatible physical potentiometer, and a coupler connects the motor shaft to the target knob which will turn as the Servo turns."

The unit uses servo motors, which can be digitally controlled and move to a precise angle. Each motor is controlled by a microcontroller that receives MIDI signals or the internal Expression Pedals and then converts these signals to the 270 degree Servo motor range. Meanwhile, each expression pedal input features 2 knobs: MINimum and MAXimum. These are used to set the range of action of the expression pedal, allowing to dial the range to any sweet spot desired.

Expression Control and Servo Controller are available now and priced at €220 and €320 respectively. ​ To learn more, ​ including specifications, features and specific application examples, please visit www.addacsystem.com. ​

About ADDAC System

​ADDAC develops advanced instruments for sonic expression. The company started back in 2009 with an ambition to explore the potential crossover between analog synthesizers and computers. Because its first creations sparked a lot of attention, ADDAC decided to work hard and put them in customers' hands. Today our product line is focused on a new breed of hybrid synths, that make use of the best of both the digital and analog worlds. We've grown to be able to reach thousands of enthusiastic clients, friends and collaborators. Always looking into conceptualizing and developing the most exquisite instruments, we hope you're able to join and share this passion with us.

Our solutions can be found in many personal studio throughout the world, owned by musicians in several planes of stardom. We especially appreciate seeing them being used in a very wide range of musical genres.