The analog automatic mixer shall have four microphone and three line level inputs in a 1-U, 19" rack mount case. The microphone inputs and the master output shall be balanced, RF-filtered, and provide 3-pin XLR connectors. Each channel shall have switchable +24 V phantom power for condenser microphones. The line level inputs and recording outputs shall be unbalanced, RF-filtered, and provide RCA jacks. The automatic mixer shall use gating to achieve automatic mixing. Each channel shall have a user adjustable "Voice Zoom" compressor/ leveler function to compensate for level variations due to variations in the distance between talker and microphone. Microphone channel no. 1 shall have a switchable priority mode. Signal present in this channel shall automatically cause all other channels to be attenuated by 12 dB. The master output shall have a two-band shelving (bass and treble) equalizer. The automatic mixer shall be capable of being daisy-chained.
