Grass Valley Maestro Master Control v.2.4.0 - Manual (Page 251)

247 MAESTRO User Manual
Section 2 — Basic Maestro Operation
Audio Mixer Operation
Note Audio over inputs are AES only; embedded audio for mix overs is not sup-
ported. There are two AES audio over inputs on the rear panel and four
internal audio mixers. If using a Sonata AES-to-MADI converter, see the
MADI Audio Expansion Section of the Maestro Installation and Service
manual or the Sonata Series Planning and Installation Manual.
Audio Mix-Over Controls
Maestro has four independent audio mixers; see the note above regarding
formats and number of available inputs. The audio inputs defined for
audio mix sources can take advantage of input channel mapping in the
same way as sources intended for the Program and Preset busses. Channel
mapping and the drill-down screens for audio mix over sources function
identically to those used in mapping Program and Preset sources.
The mixers are capable of performing an audio mix-over on Preset at the
same time as providing a separate audio mix-over on Program. Like the
keyers, the mixers can trade places with each transition. This allows an
audio mix-over to be set up on Preset and then be transferred to Program
with a transition.
Mix Source Selection
The Preset or Program audio mix source is selected in the same manner as
a key source, except that the Mix Preset buttons are used instead of the Key
preset buttons. The four mix source buttons are numbered as
Mix 1 thru Mix
4 from left to right. Some early hardware control panels shipped before
Version 1.3 do not have labels on the Preset Mix bus buttons. (All GUI
control panels have the correct Mix labels.)
Mix to Clean Feed
Maestro provides a clean feed output which is a subset of the elements con-
tained in the program output stream. Clean feeds are commonly used to
transmit just the main program video and audio content without any keys,
transitions, audio overs, etc. These elements are added in the local markets
receiving the clean feed. However, it may be desirable in certain situations
to add mix over audio to the clean feed output. Maestro now supports the
“Mix to Clean Feed” of individual audio mix overs.
Figure 150 shows a representation of the Audio Control sub-panel on the
Maestro Control Panel with the Mix to Clean Feed buttons above each audio
mix over.