A Standard AEC Reference is used for applications in which the microphones are not being reinforced to the room they occupy. A Custom AEC Reference is used for applications in which the microphones are being reinforced locally. The Custom AEC ...
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.
Make sure you have updated to the compatible version of software for your firmware version. Older versions of software are not forwards compatible wheras the newer versions of software can connect to older versions of firmware