detect sudden change

i have pair of floats i wish to monitor for sudden changes, i use [split]
with dynamic +5 -5 on the range pins. that does detect the changes, my
problem is...
1] given 2 a pair of numbers, is there some kind of calculation that can set
them apart as a pair or do i need to run the split after [unpack].
i now use [Lcent] for this, but maybe there is a better way.
2] watch the lower pair of [multisliders], they make the jump to the new
value but then return to the smoothed output and climb from there.

i am sure there is a method or order of doing thing i miss.
ideal is an object that only slidessmooths a list if it is in a predefined
range otherwise it jumps straight to the new value.