VOX Functions
The VPBAPI allows the user to control the VOX firmware
for each channel.
The VOX algorithm switches on when the audio level exceeds onlevel.
When the audio level falls beneath offlevel, a counter is
started. When the counter exceeds runon milliseconds, the VOX
algorithm switches off. The overload level is defined as 0 dB, the
default on and off VOX levels are -12 and -18 dB respectively. The
default runon duration is 2000 ms. The VOX parameters may be
re-programmed using the vpb_setvox() function.