Here are couple example rigs (Timmons and Thorn) with "global" delay/reverb expression pedal. So they have programmed some presets, but have still additional 'master' wetness controller. Used through the gig and songs (ambience, effect).
Not sure does the master mix get changed through preset changes. Most probably as it is possible to program Strymons with MIDI program changes. Or not if user so prefers. Such user selection would be nice to have with KPA also. So let the user decide.
Maybe it would be possible also to select for each delay/reverb (or even any other pedal or continuous controlled parameter) whether the parameter should follow the current SLOT specific morph controller or another, global, one.
These players in the videos control delay mix via pedal. That application is no real suprise and can be achieved with our Morphing. If you lock the DLY module, your delay even becomes global. The videos don't directly make a case for needing something like Morphing on top of a delay mix pedal. Actually these traditional analog floor board setups shown in the videos cannot simultaneously morph parameters across various stomp boxes and amp and cab at all.