Too sad to hear that… would be a great function!!!
Other idea. As I understand in BYP+DLY mode the delay will keep sounding after I hit the bypass switch form on to off right? But what if instead of that I switch from preset A to B, and preset B is a Blank (no delay set) preset? Would that do the effect of sudden stop?
I think that could work. Unless the "spill over" function works between presents change too?
I assume you are using TF. This has a feature called SPILLOVER, which if set, will preserve the delay "tails" from the previous preset. Note that these tails are now going part of a different effect, so may change in sound.