Grass Valley Maestro Master Control v.1.7 - Manual (Page 144)

140 Maestro Channel Branding User Guide
Section 5 — The Maestro Configuration Editor
One possible reason for using pass through is when the user doesn't want
any changes to the audio signals at all (this is not common). In pass through
mode embedded audio will be switched simultaneously with the video.
VU Meter Reference Level
Choices range from -12 dBFS to -24 dBFS in 1 dBFS increments.
Default: -20 dBFS.
This option selects the reference level that results in a "0" VU reading on the
meters. The default is -20 dBFS which corresponds to the SMPTE recom-
mended practice and is usually used in the United States. Another com-
monly used value is -18 dBFS which is used in some European countries.
PPM Meter Reference Level
Choices range from -12 dBFS to -24 dBFS in 1 dBFS increments.
Default: -20 dBFS.
This option selects the reference level that results in a mid-scale or reference
reading on the PPM meters. The default is -20 dBFS which corresponds to
the SMPTE recommended practice and is usually used in the United States.
Another commonly used value is -18 dBFS.
Default Mix-Over Ratio
Choices range from 0 dB to -24 dB in 1 dB increments.
Default: -12 dB.
This option selects the mix-over ratio for audio mix-overs. This value
defaults to -12 dB, which means the background audio will drop by this
value (-12 dB in this case) when a mix-over is enabled. This value applies
to all mix-overs and is the default when a mix over-source is assigned to a
mixer.
Note A 0 dB mix-over means that both the background and mix-over source will
be mixed together at full level.
Default DIM Value
Choices range from -10 dB to -30 dB in 1 dB increments.
Default: -20 dB.
This option selects the amount the audio monitor output is attenuated
when the DIM button is pushed on the control surface. This option is typ-
ically used when the operator answers the telephone or intercom and needs
to quiet the audio monitors but does not wish to change the level control.