Panasonic RAMSA WR-DA7 - Manual (Page 50)

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10. New 3+1 Surround Mode
Previous Versions: The Surround Mode was always set to 5.1.
Version 2.0: Selecting the Surround Mode for 5.1 or 3+1 is now possible in
the [UTILITY>CONFIG] window. If [3+1 SURROUND MONITOR] area is
[OFF], then the mode is 5.1 Surround. If [3+1 SURROUND MODE] area is
[ON], then the mode is 3+1.
In 3+1 Surround Mode, Bus1 is "L", Bus2 is "R", Bus3 is "C", and Bus4 is "S".
"S" is for rear signals. And Bus5 through 8 operates as the normal Buses.
When the [SURROUND MONITOR] in the [SOLO/MON] window is [ON], or
if the Surround Channel is Soloed, then this function can not be changed. To
change this function, turn the SURROUND MONITOR and all of Surround
Channel’s Solo to off.
[UTILITY>CONFIG] window