Locking out envelope stages

[Perfect Day]

I've come across this in the using the A6 document , but cant get it to work . Soft knob 8 doesn't do anything when I'm on the envelope time page . Does anybody know how to make it work ?

-Locking out undesired stages.
On the Envelope Time pages, Soft Pot 8 Enables a feature
called Lock, which causes all stages that are Off at that time to
remain Off regardless of their pot setting. All active pots will
remain active even if you set them to their minimum setting.
This of course allows you to use the controls as if it were a
typical analog hardware Envelope, which is especially comfortable
if you enjoy settings at or approaching zero without worrying if
you'll disable a stage as you perform.

[sunny pedaal]

i also tried it in the past, think it in fact was never implemented.
just put times/levels to 0 and keep them there i'm afraid