My workaround is to mute Mainstage and to start and immediately stop the playbacks and to demute again.
This takes about 3 seconds and then the files are armed and ready (like the QLab Load feature:-)
But I do not always have these 3 seconds during the show.
It would be perfect if I could generate a short note command (minimal length) when changing into this preset.
Different HD is not possible.
Appreciating your help, Joe!