Vortex Media VTX 1000 - Manual (Page 82)

Each group of microphones, the codec, and the interface module are sent at 0 dB to Output T. The Program
Audio signals are attenuated by 10 dB and then sent to Output T. This is done so that the local and codec
speech are "biased" above the program audio. If the program audio is sent at 0 dB to the far side caller, it
may be difficult for the far side caller to differentiate between local speech and program audio if both
signals are active at the same time.
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