@Zoyt What is the meaning of this line : sID = s.
I like your idea I was looking for somethng like this. 
Is there a program whith this structure available somewhere?
@Ignatz I was not sure of that. The parameter s is used 2 times in the example . In the setup as type number and in the function changeScene as type character(s). I do not like it ,if you do that in a large program it is very difficult to debug. Can you change it in your tutorial, then you have a “clean” example program and better to understand.
@Dreamdancer - Haha… I didn’t catch that. What I’m doing in the setup with the parameter.integer is declaring the local variable name to pass the current number on the slider in the callback function. The version of s that is passed into changeScene() is the name of the scene to change to. A little confusing, sorry.