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Playing the same music in all zones (All Zone Stereo)
You can play back the music being played back in MAIN ZONE simultaneously in ZONE2 (separate room).
It is useful when you want to enjoy the same music at the same time in multiple rooms during home party or when you want to play back the same BGM in the entire house.
Press OPTION.
An option menu screen is displayed.
When the input source is “HEOS Music”, an option menu for online music is displayed. Select “AVR Options…”, then press ENTER.
Use 
to select “All Zone Stereo”, then press ENTER.
to select “All Zone Stereo”, then press ENTER.The “All Zone Stereo” screen is displayed.
Select “Start”, then press ENTER.
The input source for ZONE2 is switched to the same input source as for MAIN ZONE, and playback starts in the All Zone Stereo mode.
Stopping the All Zone Stereo mode
During playback in All Zone Stereo mode, press OPTION.
An option menu screen is displayed.
When the input source is “HEOS Music”, an option menu for online music is displayed. Select “AVR Options…”, then press ENTER.
Use to select “All Zone Stereo”, then press ENTER.
to select “All Zone Stereo”, then press ENTER.Select “Stop”, then press ENTER.
The All Zone Stereo mode is canceled even when the power supply of the MAIN ZONE is turned off.
In the All Zone Stereo mode, only the “Multi Ch Stereo” and “Stereo” sound modes can be selected.
When “HDMI Audio Out” is set to “TV”, the All Zone Stereo mode is not available. link