The Unite 200 does NOT have a microphone. The line level audio input on the front of the camera is embedded into the video that is streamed from the camera through the LAN port. This audio can't be utilized over the USB or HDMI outputs.
In the computer if you set the audio input to USB Audio, the audio from the red (line level) port on the side of the Versa hub can be used - you can then record that audio to a file and play it back on the computer.
Status LED: • Off: Unit still initializing • Blue - Fast Blinking: Stack Syncing in progress • Blue - Slow Blinking: Unit not configured • Blue - Solid: Configured unit • Red - Fast Blinking: Stack Sync error
AGC keeps an input signal at a target gain level that you select, and is generally used for Line Input channels. ALC automatically keeps an input signal at a constant level, and is generally used to keep speech levels constant on Mic Input channels.