Polycom SoundStructure C16 Design Manual page 654

If the reference's virtual channel is mono, then the corresponding physical channel is used as the AEC
reference. If the reference's virtual channel is stereo, then either the left or right physical channel is used as
a reference, depending on which index is specified (1 for left, 2 for right).
If the AEC is on a stereo virtual channel, then the reference specifications apply to both physical channels
of the stereo virtual channel.
Enable Automatic Gain
Argument Argument value
Channel Type Virtual Channel
Value Type Boolean
Read/Write Mode Read/Write
Phys Chans Conferencing Mic/Line Input, Sound Reinforcement Mic/Line Input, Analog Telephony Input
Virt Chans Mono, Stereo
Default 0
Event Source No
Description
This parameter enables (1) or disables (0) the automatic gain control (AGC) algorithm.
Polycom, Inc.
Control—agc_en
654