Combining motion and sound

The main window's Motion and Sound panels each start with a switch: Motion starts recordings and Sound starts recordings. At least one stays on.

• Motion only — the default, and right for most cameras.
• Sound only — useful for a dark room, where the camera can't see anything useful anyway.
• Both on — whichever happens first starts a recording.
• Both at once — tick Only when there's movement at the same moment in Settings › Sound: motion and sound must happen within a few seconds of each other. This is the most effective false-alarm filter there is: headlights sweep a wall silently, and a refrigerator hums without moving, so neither can trigger alone. The cost is that it misses anything genuinely quiet.