The two rightmost jack outputs (11 and 12) can be configured as expression or switch pedal input. You can enable and configure it in the global settings. The Erae can handle both footswitch (On/Off) and expression (potentiometer) pedal with continuous output.

For the footswitch pedal (with On/Off actions), you should configure the pedal as a button or a note, you have the same configuration options as a button element.

For the expression pedal, the continuous value can be freely assigned to any MIDI CC output.

‍