I recently add a third expression pedal via midi, as a classical set up, I have already one pedal controlling volume and the second one controlling the Superknob. But I hadn’t plan that an expression pedal, apart from controlling the volume or the SK can control only parameters of one part depending of the midi channel you use. That’s the limitation, tell me if I am wrong.

I was dreaming to have a second “virtual” super knobs with this third pedal but that is not possible. It will have been useful that Yamaha implements a virtual SK for expression pedal. Why? One SK is not enough for you, you want two SK? the right foot that trigger the volume pedal have plenty of free time during the play, so why not ? crossing two superknobs with the feet could open exiting perspective, I think.