Ok, now that I understand what you mean, let’s look at this way. In your example, you have 8 programs.
Short Hall &.8th delay
Short Hall & 8th delay
Short Hall & 8th into .8th delay
Short Hall & .8th into 1/4 delay
Short Hall & 1/4 delay
Modulated Plate & .8th delay
Modulated Plate & 8th delay
Modulated Plate & 8th into .8th delay
Modulated Plate & .8th into 1/4 delay
Modulated Plate & 1/4 delay
As you switch from one program to the next, the reverb will stay constant, but the delay trails of the previous program will continue to trail out as you play along with the subdivision of the new delay time. It’s actually more seamless than switching to a different delay preset which would cause the delay to immediately change subdivisions as it’s trailing out.