Is it possible to stop all layers at one time by midi ?
If so, I can I do that ?
There is no direct interaction to do so.
However, you can use a "cue" to do so : open the time-panel on the right of the dashboard, and click the "cues" button. Then create a new "cue" and assign your MIDI signal with CMD+M.
I go to the step of creating the cue but after I don't see what must I do. Can you explain me.
Stop all columns and create a cue : a "stop" will be created under these conditions. Of course you can edit later this cue. Then press the "recall" button to stop all your columns.