Recall-safe

Digital consoles have the ability to save "scenes" or settings, and to recall them (load them) when needed.

This is useful for festival-style events, where there are multiple bands appearing - in this case, you would assign a scene for each individual band, so that the settings can be recalled as each band goes onstage.  It saves a huge amount of time.

It is important though,  to protect, or lock, particular channels, so they are not affected by scene recall.  This is essential for channels such as the MC's mic - you certainly don't want to accidentally fade this channel down as you are recalling the scene for the next band!

The solution is to "recall-safe" these important channels, so they are unaffected when you change scenes - as shown in the following video.