CM pilot 1
It's sure confusing. One way to make out if it's real time speed is it will move gradually as the surface extends. VFE changes instantly and even if the surface doesn't extend but VLS changes gradually. If S or F speeds don't change with a jam then they are predetermined. VLS remains correct with proper flap/slat configuration or even with one or both surfaces jammed. Also if S and F speeds are correct then there's no need to select speed but procedure demands it.