If you are a MOD Duo user, please read this important notice before proceeding with the installation of this new firmware.

Dear community, a new firmware update has arrived on planet MOD!

The update enables the Control Voltage inputs and outputs on the MOD Duo X, and it brings a bunch of new and exciting features on top.


So… what’s new?

Control Voltage support

The Duo X now has its CV inputs and outputs enabled.
This means that the physical ports now have their software counterparts displayed in the pedalboard assembler window in the web interface.
You will see three inputs (two for the CV inputs, and one for the expression pedal) and two outputs (for the CV outputs).

Control Voltage support

In the Duo X device menu, there are now settings for the CV inputs and outputs.
There is a switch to toggle between CV and expression pedal mode, and a switch to toggle between headphone and CV mode. For the expression pedal input, there is also a switch to toggle between signal-on-tip and signal-on-ring, please consult your expression pedal’s manual to find the appropriate setting.

Duo X Menu

Duo X Outputs and Inputs

Addressing arbitrary parameters to CV signals

It is now possible to address arbitrary plugin parameters to a CV out port. This feature works for arbitrary plugin CV outputs, and the hardware CV inputs (which show up as CV out ports in the web interface).
It is also possible to address multiple plugin parameters to the same CV port. By using the “MOD Control to CV” plugin you can use this feature to create macro controls.

You can manage which CV out ports are addressable by clicking on the “Manage CV Ports” button on the top of the pedalboard constructor window, and then enabling the specific CV ports that you want to use by clicking the checkboxes beside them.
You can give them a custom name so that they are more recognizable.
Then, in the parameter addressing dialog, you can pick that CV port from a dropdown list.

Manage CV Ports
Cv Capture

Get started using the newly enabled CV and Expression I/O


Quick usage with expression pedal: in the device menu, under system > inputs, set CV/EXP INPUT to EXP. Set the appropriate EXP MODE. Now you can assign your expression pedal to one or multiple parameters by selecting “CV” in the parameter assignment window, and selecting “Cv Exp Pedal” from the dropdown menu. There is also a CV output representing the expression pedal on the left side of the pedalboard constructor window, so that you can route the signal to CV inputs of your choice. 

Quick usage with CV inputs: in the device menu, under system > inputs, set CV/EXP INPUT to CV. Now you can assign your CV signals to one or multiple parameters by selecting “CV” in the parameter assignment window, and selecting “Cv Capture 1” or “Cv Capture 2” from the dropdown menu. There are also two CV outputs representing the two physical CV inputs on the left side of the pedalboard constructor window. Use them to route the signal to any CV input on the pedalboard. 

Quick usage with CV outputs: in the device menu, under system > outputs, set CV/HP OUTPUT to CV. Now you can send CV signals from your pedalboard to outside equipment by patching the signals into the CV ports on the right side in the pedalboard constructor window. 

Smooth peakmeter color transitions

We found that the way our audio-peakmeter LEDs were used often confused new users, and resulted in sub-optimal gain settings and headroom.

To help remedy this, some changes to their behavior were made. Most notably, the transitions between colours are now smooth instead of static, giving a much more accurate indication of the signal level.

The following ranges are now used by the peakmeters:





-40 dB

All LEDs off

-40 dB

-6 dB

Green fade in

-6 dB

-1 dB

Green fully on, yellow fade in

-1 dB

0 dB

Only red on


Red blinking (digital clipping is occurring)


When the value reaches anything above 0dB (digital clipping) the LEDs will blink red just as they did before, to give a clear indication that the audio is being distorted.

There’s also quite a few more changes and tweaks. You can read the changelog below:


Update 1.9 Changelog

Changes for all devices:
  • General tweaks, bug fixes and improvements
  • NEW: addressing a parameter to a CV output port
  • NEW: compact pedalboard list view
  • NEW: show CV port information in plugin info dialog
  • NEW: show MIDI program number/indexes near snapshot names
  • NEW: smooth peakmeter color transitions
  • NEW: support mod:volts as parameter unit
  • Allow pedalboard snapshot navigation via MIDI program changes while the web interface is open
Duo specific changes:
  • NEW: add LED blink when pressing footswitches for triggers and enumerations
  • NEW: add LED animation for Duo bank navigation with footswitches
  • NEW: 5.4 LTS mainline kernel and further support for NAND units
  • brought back direct headphone monitoring option
Duo X specific changes:
  • NEW: potentiometers calibration mode
  • NEW: add CV related options to device menu
  • NEW: reading from and writing to hardware CV ports
  • NEW: enable SPDIF output (coaxial)