When I get home I’ll look at it (I’m in the car now). Thank you again for the excellent work… I would like to have your knowledge of the Arduino language… I have a lot of ideas that I can’t put on the IDE due to my ignorance… 
I initially built a pedal for the EXPRESSION using an old volume pedal with an Arduino Pro Micro… then I built the complete controller with 16 controls… but it bothered me to have two Arduinos used for the same thing… I then added a jack socket to the controller to connect the EXPRESSION pedal, I removed the Arduino from the pedal and used an Arduino analog port (The other controls occupy all 16 pins of the Multiplexer). I attach the new sketch…
Thanks again to @mbvs
ControllerSax_display_Expression.ino (8.0 KB)
P.S.
I asked the Artificial Intelligence to modify the sketch so that the LED flashes only when a control potentiometer moves (Arduino Pro Micro does not have Pin 13 connected to the on-board LED)… Perfect!!! It works… I attach the sketch modified by the A.I.
Controller_I.A.ino (4.7 KB)
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