Sustain pedal to send midi?

[User]

No unfortunately these jacks are only for MIDI data. That would be pretty sweet though. Nothing to stop you from using the pedal with a MIDI controller and sending that CC date to the target of your choice through the MRCC, however.

You mean like pluging the sustain pedal to a keystep pro for example and changing that cc message with the MRCC to achieve something else (like triggering Rec on Octatrack)?

There is no expression (0-127) pedal input in KSP - only sustain (0/1). Most of portable gears have no any input or sustain only. And only one...