Automatic Mixers

To put it simply, automatic audio mixers sense a signal coming in through an input source, and pass that signal on to an amplifier or whatever the next signal processing unit is in the audio chain. Typically a church will use an automatic mixer to manage the several microphones that are on the altar. When the automatic mixer sees that audio is coming into it, it turns that particular channel on and sometimes, but not always, closes off or lowers the volume on the channels where it does not detect an incoming audio signal. There are many ways to program an automatic audio mixer, so I am just giving you one specific example.