hmm... the specific example i was showing at 51:50 was the same amp, just turning on/off the drive pedal.In this particular scenario you're using two different amps but with scenes? Practically speaking as configuration and the intricacies of the unit, i have no idea what you did. That's why things will make more sense when i have the unit.
to do it, i changed from Scene 1 to Scene 2. the Amp type did NOT change from X to Y from S1 to S2, only the Drive pedal was turning on and off.
i could have also just pressed the "Drive on/off" button and it would have accomplished the same thing.
but a Scene allows you to press multiple "on/off" buttons at the same time. make sense? so you could turn On Drive and Delay for a lead sound, then turn them both off by switching Scenes.