Calibrating Resistor Ladder Aux Switches

Overview

The Resistor Ladder Aux Switch feature for the Omniport allows you to connect up to 8 (for the MC3/MC6MKII/MC8) or 16 (for the pro series) external switches using Omniport 1.

We are currently not manufacturing the aux switch but you should be able to find a third party manufacturer.

Schematic

The recommend resistor values can be found below. Different values may be used, as long as the controller can read a different value on each switch during the calibration process.

Only the Tip and Sleeve is used in the Omniport. The Ring connection is ignored, so you can use a TS cable with this.

Setup Process

Configure Omniport 1

Connect to the Editor and then set Omniport 1 to Resistor Ladder Aux Switch
Save settings and restart your controller to apply the new Omniport settings.

!IMPORTANT! Calibration can only begin after applying the correct Omniport settings and restarting the controller.

Calibrate Switches

Go to Controller Settings > Configure Omniports. Click on Calibration Menu. This will open the calibration menu on your MC controller, which will display a value based on the resistance it reads.
Press and hold down one of your resistor ladder aux switches to see its resistance value on your MC controller display (look at your MIDI controller display to see this).
Enter that value under Trigger Value on the Editor, and map it to your desired function as shown below.

In the example above, the resistor ladder switch has a resistance value of 11, which has been mapped to MIDI Clock Tap Tempo.

If the value is jittery during calibration (i.e. it shifts between 20 and 21), you can select either value as there is a +-1 buffer for the value. For example, if you have the trigger value set to 20, a value of 19 and 21 will also trigger it.

Continue this process for the rest of the switches.

Updated on: 21/07/2026

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