Nodebundle for playing with nodes

 From:  Barry-H
7777.920 
Hi Santa,
I have tried to create a node that takes an input from a widget knob and and outputs until a condition is met then stops.
ie: Knob 0 to 100; if condition met at say 40 and I turn the knob further the output would remain at 40.
So HELP please I'd like idea's for Xmas.
Barry