These are the product details for the ADDAC125 Strings Mute, part of ADDAC System's ADDAC120s Four Strings series, available at Takazudo Modular.
The ADDAC125 Strings Mute is a 10HP servo-driven mute module inspired by Fender's mute systems (such as the Jaguar and Bass VI). A servo presses a foam pad against the strings to lightly dampen their vibration, producing a unique tone distinct from palm muting.
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- Product Photos
- Overview
- Connecting to the ADDAC124
- Specifications
- Background
- ADDAC120s Four Strings Series
Product Photos




Overview
The ADDAC125 Strings Mute is a module for adding a muting effect to the strings of the ADDAC120s Four Strings series. A servo motor raises and lowers a foam pad (a sponge-like pad), pressing it against the strings to lightly dampen their natural vibration.
The inspiration comes from the mute systems found on Fender's Jaguar and Bass VI. It's not as strong as palm muting (a technique where you mute the strings with the side of your hand) -- instead, it lightly suppresses the strings' resonance, creating a unique tonal character. The height of the foam pad is adjustable, letting you vary how strongly the mute is applied.
For the most effective results, this module is recommended to be placed near the headstock.
Connecting to the ADDAC124
The ADDAC125 Strings Mute is a passive module with no control circuitry of its own. To drive the servo, you need to connect it to ADDAC124 Plectrums, the series' plectrum module.
There are two ways to connect it:
Remove one of the plectrum servos on the ADDAC124 and connect the ADDAC125's servo in its place
Use the included splitter cable to connect it in parallel with an ADDAC124 servo (in this case, the plectrum and the mute operate at the same time)
Using the parallel connection, you can combine the plucking action and the muting action to play them together.
Specifications
Width: 10HP
Power consumption: 100mA +12V (only when the motor is active)
Passive module (controlled by connecting to ADDAC124 Plectrums)
Background
The ADDAC125 Strings Mute was developed as part of the ADDAC120s Four Strings series, which uses physical strings as its sound source. The concept of the series is to engage with the string as a material through a variety of approaches to produce sound.
Within that, the ADDAC125 takes on the role of physically dampening the strings' resonance. By replacing the mute mechanism that has long existed on electric guitars and basses with electronic servo control, this module makes it possible to automate string muting within a modular system.
ADDAC120s Four Strings Series
The Four Strings series is available both as individual modules and as bundle systems. Our shop carries only the frameless ADDAC120BS Strings Basic System. If you'd like a larger setup, please consider adding other modules from the series separately.
Modules / Frames
A matched pair of Headstock (17HP) and Bridge (6HP) panels with 4 locking tuners for easy string installation. Passive stainless-steel construction raises strings high enough to fit other modules underneath. Includes a string set (.010–.046), bow arch attachment, and small resonators.

A 10HP humbucker pickup module with an integrated pre-amplifier delivering synth-level output. Features TONE and VOLUME knobs plus a LOW/HIGH gain switch. Height-adjustable via mounting screws; the pickup can be removed for handheld use.

A 14HP quadraphonic pickup with 4 independent coils — one per string — each with its own pre-amplifier, VOLUME knob, and output jack (STRING 1–4), plus a MONO MIX output. All coils are hand-wound with Alnico 5 slugs, 44AWG polyurethane wire, and ~7.4kΩ per coil.

A 14HP plectrum module with one servo per string, triggerable via push-button, gate, or MIDI (USB + TRS). Offers Pluck mode (~20° swing to pluck the string) and Harmonic mode (~10° tap for harmonics). Up to 3 units can be daisy-chained.

A 10HP servo-driven mute module inspired by the Fender Mute (Jaguar/Bass VI). A foam pad lowers onto the strings to create a gentle dampening — a distinct tonal character different from palm muting. Passive module; controlled by an ADDAC124 Plectrums servo.

A 10HP module with a 7,000 RPM brushless motor spinning 4 magnets. When the motor RPM matches a string's resonant frequency or harmonics, the rotating magnetic field excites the string — similar to using a bow on an electric guitar. Speed is controlled by a SPEED knob and CV input.

A 16HP mechanical harness and sliding rail for a standard Ebow. The included Ebow is modified with the "PianoBow" mod (feet sanded down) so it slides freely below all strings without contact. Height is adjustable via thumb screws. Passive module; no power required.

Four Strings Systems (Bundles)
Bundle pricing works out cheaper than buying the modules individually. Since the modules included in a bundle are essentially required to produce sound, we recommend starting from a bundle and adding other modules to it.
| Product | Set price (incl. tax) | Total of unit prices (incl. tax) | Bundle discount |
|---|---|---|---|
| ADDAC120BS Strings Basic System | ¥80,800 | ¥84,400 | -¥3,600 |
About ADDAC System
ADDAC System is a modular synthesizer maker based in Portugal.
Their lineup is built on solid, no-nonsense modules that make the most of analog character. At the same time, they have released plenty of inventive modules that bring digital technology into the mix in a tasteful way — flexible CV-to-MIDI converters, deeply controllable granular processors, and more.
That concludes the introduction to the ADDAC125 Strings Mute.
Able to automate a string-damping mute mechanism in combination with the ADDAC124 Plectrums, this module is designed to broaden the range of string expression within the ADDAC120s Four Strings series.
We hope you found this helpful.

Register your email and we'll let you know when it's back in stock.
We're accepting advance reservations. After we confirm your registration, we'll email you the details.

