How does the VOX action work
Each MVX-A16 port on the matrix has a VOX (Voice Operated Switch) detector circuit (similar to a noise gate)
When the audio entering the input of the port goes above the threshold level of the VOX - (the setting is adjustable using the ECS configuration software from -45db to 0db)
The VOX will trigger a Control action . The Control action can be programmed to make audio routes or fire relays.
Extract from ECS manual:
The VOX Action allows a Control to be attached to a port. Whenever the audio level at the Port reaches the Audio Detection Threshold defined in Voice Operated Switch the Control attachments such as Relays, Routes or Speed Dials, are activated.