Pioneer VSX-D412K Operating Instructions Manual page 29

Controls and displays
12 LOUDNESS
Lights during Loudness listening.
13 TUNER indicators
STEREO : Lights when a stereo FM broadcast is
being received in auto stereo mode.
MONO : Lights when the mono mode is set
using the MPX button.
TUNED : Lights when a broadcast is being
received.
14 Master volume level
Shows the overall volume level. --- dB indicates
the minimum level, and – 0dB indicates the
maximum level.
Depending on the level settings you make for
each channel, the maximum level can range
between –10dB and – 0dB.
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