NewTek 3Play 820 - Manual (Page 130)

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This brings us back to the A + B Output Mode. You may wonder what effect different controls
will have in this special ‘tandem mode’, and what will be displayed on the Replay Desktop.
11.2.1 CONTROL AND A+B MODE
In broad terms, the special A + B mode causes transport control operations (Play, Stop, etc.) to
occur in tandem, while other operations – such as changes to Control Mode, clip selections, and
the like – apply exclusively to the dominant (or visible) output.
For example, when A is lit along with A + B on the control surface or Replay Desktop:

The Replay Desktop displays the operational state for Output A.

Pressing Stop or Play affects the sources on both *outputs.

Selecting a different clip (or Clips List /Play List page) affects the visible output only – in
this example, Output A.
* For Live video sources, transport control operations are invalid when Record is disabled,
and will have no effect.