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Audio Enable > Active Polarity:
This sets the polarity necessary for the unit to enable the speaker of the radio to
pass beeps.
Trunking Delay Input > Active Polarity:
This sets whether the unit needs an active low or active high indication
from the radio to indicate a trunked channel has been established.
Trunking Delay Input > Debounce:
If checked the unit will require a continuous active state for 30 msec before
accepting the channel acquisition.