Visual Circuits Firefly User Manual page 108

Remote Control
If your Firefly already has this feature enabled, you may select
"External Only" for a given channel to only have a continuous
external feed. (Example: You always want local television, such as
news and weather, playing on the Channel 4 monitors). If you do
not want to have a continuous external feed, you may leave the
setting to "Internal" and schedule external events (if desired) from
within the playlist editor.
NOTE
External Audio/Video is an optional feature enabled
by a pre-programmed Smart Card.
If your Firefly does not have the External A/V feature
(menu items are "grayed out") and your application
requires it, contact a Visual Circuits representative at
1-800-250-5533.
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