Operation Manual

Specify an input signal when "HDMI", "COAXIAL", or "OPTICAL" is
selected for "Audio Selector". Set this item if noise is produced, or
truncation occurs at the beginning of a track that follows a gap when
playing PCM or DTS sources.
"Off": To play an analog signal when there is no digital signal.
"PCM": To fix the input source to PCM.
"DTS": To fix the input source to DTS (except for DTS-HD).
Changing "Audio Selector" setting changes "Fixed Mode" to "Off".
In the following cases, the settings for "Source Setup" cannot be
changed:
– When selecting the input selectors "AM", "FM", "USB",
"BLUETOOTH".