Yamaha RX-S601 Owner's Manual page 83

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Video Out (Video)
Selects a video to be output with the selected audio source. For example, you can
watching the video while listening to the radio.
Input sources
TUNER, USB, Bluetooth, AUX
Settings
Off (Off) Does not output video.
HDMI 1–6, AV 1–3 Outputs video input through the corresponding video input jacks.
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Volume Interlock (Interlock)
Enables/disables volume controls from iTunes/iPod via AirPlay.
Settings
Off (Off) Disables volume controls from iTunes/iPod.
Enables volume controls from iTunes/iPod within the limited range
Limited (Ltd)
(-80 dB to -20 dB and mute).
Enables volume controls from iTunes/iPod in the full range
Full (Full)
(-80 dB to +16.5 dB and mute).
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