The ZC-FIRE is a special case of Preset selection using a voltage driven switch to select the Fire State. The ZC-FIRE must always be used as ID#2. The ZC-FIRE can be activated either when the voltage switches from +V to Ground or from Ground to +V. The ZC-FIRE is capable of either muting all outputs in the event of the Fire State, or recalling a desired preset. The example below shows the ZC-FIRE and the selections that are available.