Grass Valley PDR v.2.1 - Manual (Page 80)

Chapter 2 Using the Profile Configuration Manager
64 Profile Family
To change the input clocking:
1. Choose Options | Audio Configuration. The Audio Configuration dialog box
appears. Click the Input Clocking tab, if it isn’t already displayed.
2. Click the button in the Audio Clock Reference Source column for the desired
channels and select one of up to five choices: System (default) or Video
Input. (The number of video inputs depends on the number of available
video channels.) Selecting one of the video inputs sets the group of four
channels to use the selected input as their audio clocking source.
3. Click OK to accept your changes or click another tab.