A Sequence Button can be locked so that the Sequence activated by the button will not be overridden or change. This can be used to light  up any are, with any of the patched lights, and to ensure they will not change no matter what other Sequences are playing. The illustration below shows a locked button indicated by a green and white lock on the right hand bottom corner of the sequence button. A sequence button that is lock will also not release unless it is unlocked. Blackout also does not affect a locked sequence button. Be advised the grand master does affect a locked button.