Sony DVS-9000 System User Manual page 902

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Setting the audio mixer cross-points
To assign an audio mixer cross-point to a switcher cross-point pair (video/key),
carry out the following procedure.
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Cross-Point Settings (Xpt Assign Menu)
Press [Audio Follow].
"Enable" appears in the Audio Follow column.
In the Panel >Xpt Assign menu, press [Mixer Xpt Assign].
The Mixer Xpt Assign menu appears.
In the list on the left, select the number for the setting.
In the list on the right, select the audio mixer cross-point (machine
number).
Press [Set].
The audio mixer number appears in the Mixer Xpt column.