Thank you for the answer! I think what lock button mean lock all function. Then you press lock button, then its freeze all option and freeze changing. I think it will be optimal make this button in 3 places: Composition (global lock), Layer lock (for layer lock and cannot change footages and layer position) and footage lock(then you cannot close it and cannot change option on footage, but you can still move layers). And also you can make enable button for enaling lock in options. Something like this. I hope i can all explain correctand you understand me and my idea will be interested for you. Because now Resolume not only VJ soft. Its really universal software for a lot of ideas.