Q Light Controller+

With a script function I want to add the _SAME_ random value to multiple channels but I don´t know how to ?

I am not exactly sure what you want to achieve but it is possible using a loopback to make this work.
Basically, randomly set a level to a single fixture in one universe and then loop that value to many fixtures in another.
See attached file.
I created the control fixture in universe two and then 'looped' it back to universe one where it acts as the input for each slider of the 'real fixtures'.

Cheers
Mark

got it - but a really quirky way to accomplish the task. Thx.

quirky is a good description! It was the only way I could think of. Maybe there are others. I believe the scripting part of QLC+ 5 will be more developed than QLC+ 4.