Grass Valley Maestro Master Control v.2.4.0 - Manual (Page 222)

MAESTRO User Manual 218
Audio Controls
About AES Reference
The following information should be referenced when using AES reference:
• Grass Valley recommends that an AES reference is only used when it is
widely used in a facility for all AES audio sources. Otherwise, Grass
Valley recommends using the video reference alone, especially for
Embedded Audio applications.
• When Dolby-E audio is passed through the system, you must use an
interlaced video reference.
• When AES reference is used, the AES reference must be properly locked
to the video reference.
• The AES reference must always be terminated with a 75 ohm termi-
nator even when not actively in use.
• For systems using the AES Audio inputs and the Video Reference
input, you should use of a video reference that utilizes SMPTE S318M-
1999.
Audio Group Selection Cluster
The eight soft buttons on the right side of the VGA display are used to select
the audio group being monitored, controlled and metered.
Note Audio groups throughout this discussion refer to user-defined audio channel
groupings and not AES or embedded audio groups. User-defined groups are
sets of audio channels that are logically grouped and adjusted together.
Examples are mono channels (single audio channel, stereo pairs (two audio
channels) Dolby 5.1 surround (six audio channels), etc.
The source for the name of the group is the Group Name column of the
Audio Output table. There can be up to 16 different audio groups in a
Maestro system. Only one audio group can be selected at a time. The
bottom-most button provides page switching if more than six audio groups
are defined.
In addition, the meter displays a highlighted border around the channels
that are assigned to each audio group to draw the eye to the correct meters.
The primary difference in home screens is that, when selecting different
audio groups, the level controls beneath the meter display change
depending upon the audio group type. For example, in a mono group, only
a level control is presented. For a stereo group, a level control, a balance
control, and a phase inversion control are presented. In a 5.1 surround-type
group, only a level control is presented. In a Dolby E pass-through audio
group, all controls are inhibited.
Pressing a group button a second time after selection causes the drill-down
screen to appear for the respective audio group. Four types of audio groups