This should do it.
If you are going to change the value of a control programatically, you
do have to use either a local variable or property node. Best to use a
local variable if you are only going to use teh value property, it's
bit more efficient.
This now watches also for the channel selector to change and reads the
value from the array of the selected channel and writes it to the
control via local variable.
The Event Structure does away with polling for most applications.
Ed

Ed Dickens - Certified LabVIEW Architect
Lockheed Martin Space
Using the Abort button to stop your VI is like using a tree to stop your car. It works, but there may be consequences.