@jfg said:

other (negative) consequences

 The Ungrouped layer method allows you to 'interlace' image layers during scene transitions. This can create some very interesting effects, since Projector layer settings are used.
However, this method is not default since by default it mixes scenes in an additive manner, where the newer Grouped by Scene option flattens each scene individually and mixes them with a more 'cinematic' crossfade not possible with the Ungrouped option.

i ve saw you have an answer but because , one question has often many answer , I would know if it could possible to use user actor ? 

Build your user actor as you builded your first scene , then past that user actor in each scene that you need it . Then each time you need ( new show ?)  Change the value in the user actor in the first scene and when close the user actor , select update all . 

It will work , no ?

Here's an example patch

The first Scene is your "preshow" scene. In this Scene you'll just press spacebar to start the cycling Scenes going in their loop.

The next three Scenes (Cycling Scenes 1-3) are identical. They have example content in them, and an Enter Scene Trigger connected to a Trigger Delay (15 secs) that will trigger a jump to the next scene after the delay. There's also a Gate (controlled by a Keyboard Watcher) between the Trigger Delay actor and the Jump actor so that if you need to program something in the Scene, you can press "a" to temporarily disable the automatic jump.

The Final Scene is an example of what to do if you want the Scenes to continue looping forever. It's essentially identical to the previous three cycling Scenes, but instead of jumping to the next Scene (because there isn't a next Scene) it jumps to the first cycling Scene, which starts the loop again.

Hope that's helpful 🙂

Best wishes,

Woland

@michel

Off course! How could I forget. Thanks a lot Michael ;o)