AYRE TK-8150 - Manual (Page 27)

During level-sensitive operation, applying a voltage to the
trigger input will set the amplifier to the “Operate” mode.
When the applied voltage drops to zero, the unit reverts to
“Standby”.
In the pulse-sensitive mode, a positive-going pulse will toggle
the amplifier between the “Standby” and “Operate” states,
duplicating the action of the left-hand front-panel button.
The front-panel button remains operative when the trigger
input is used. Therefore, using the front-panel button will put
the amplifier out of “sync” with the trigger control device.
When used with level-sensitive trigger operation, the next
trigger action will automatically restore “sync”. However when
using pulse-sensitive trigger operation, “sync” can only be
restored by pressing the front-panel button a second time.
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