Vision Operator’s Manual (v12.0 MD) Peripheral Control • Ops 10–11
Audio Mixer Control
When an Audio Mixer is connected to the Vision switcher, it can be operated in one of two ways;
normal Audio Follow Video (AFV) mode, or Override mode.
Audio Follow Video
The AFV mode is where an audio channel is taken to air when the video (Input BNC) it is
assigned to is taken to air. The audio will follow the video on and off-air like this for transitions
only on MLEs that are on-air (re-entered onto the Program/Preset MLE) unless the Audio
Transitions personality setting is set to all.
For example, there may be a number of camera setups in the studio, each one focusing on a
different talent. when a particular camera is taken on-air, you also want the audio from the talent’s
microphone to be taken on-air. When the camera is taken off-air, you also want the corresponding
audio channel to be taken off-air. This is normal AFV mode operation.
Note — If you fly a key, and then expand it to full frame, the underlying video is still on-air, even
though you cannot see it. The audio for both video signals will still be on-air. This is also
important to remember if you are running shots from memories where you bring a key full-frame
from an over the shoulder shot.
Audio Overrides
The Override mode is when the normal AFV mode has been altered, either by changing the
levels, taking more or fewer channels to air, or altering the channels that will be taken to air on the
next transition. Overrides are applied by using one of the audio custom controls. For example, if
you have an over the shoulder shot, the audio channels for both the talent and the key would be
on-air as per normal AFV. If you transition to a shot with only the VTR Clip, then the audio from
the talent would be taken off-air. If you wanted both audio channels to remain, you would have to
set up an override by turning on the audio crosspoint for the talent on the Preset bus. When you
make the transition, the switcher takes the video off-air, but keeps the audio on.
Audio Transitions
During all audio transitions, the switcher keeps track of three separate levels for each audio
channel, or group. These levels are as follows:
• Current — The Current level is the level of the channel, or group, that is currently on-air.
This level can be adjusted using the PGM Audio Lvl custom control that is assigned to
that channel, or group.
• Preset — The Preset level is the level of the channel, or group, that takes effect during
the next transition of the audio. This level can be adjusted using the PST Audio Lvl
custom control that is assigned to that channel, or group.
• Default — The Default level is the level that the channel, or group, was set to originally.
When you perform an Audio Reset custom control, all off-air audio channels will have
their preset levels changed to the default level. This will not change the Preset levels for
the audio channels that are on-air.
During an Audio Transition, the switcher prepares to take the Preset audio channel to air as
follows:
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