Yamaha AVENTAGE RX-A550 Owner's Manual page 84

Remote Color Key
Set the unit's functions for the RED/GREEN/YELLOW/BLUE key of the remote control.
Settings
Assigns the functions of playback devices connected to the unit with
Default
an HDMI cable.
Assigns the unit's input sources to each key. The assigned input
sources can be set separately.
Input sources
Input
HDMI 1–6, AV 1–6, TUNER, USB, NET, Bluetooth, AUX
Default
RED: HDMI 2, GREEN: HDMI 6, YELLOW: AV 2, BLUE: AUX
Assigns the functions of sound mode to each key.
RED: MOVIE
GREEN: MUSIC
YELLOW: STEREO
Program
BLUE: SUR.DECODE
For example, if you press the RED key repeatedly, you can select your
favorite sound program from the sound programs (MOVIE) (p.44)
suitable for the video source.
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