Apologies if this has been asked before, but I haven't been here for a while and I haven't time to search through load of posts.

After years of doodling and gigging with the Eleven Rack, I have finally discovered a use for the vib/phaser effect.

I note that the Eleven Rack Editor suggests that it can be controlled with a rocker foot pedal.

I am presently using a old Line 6 Pod as a foot controller and the foot pedal is sending MIDI 7 volume controller messages, but with a click, it switches the Wah on and off and allows me to control that instead. However, on some patches I'd like to use the pedal to control the vib/phase effect dynamically, instead of the wah.

Does anyone know what MIDI controller message I need to send from the foot controller to get the Eleven Rack to respond appropriately?
Thanks