Hyundai H-CMD4009 - Manual (Page 32)

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Audio setup
Audio out
SPDIF/Off: no digital signal out (optical or coaxial
output off), only analog audio output.
Key
Setup basic music tone.
Video setup
Brightness, Contrast, Hue, Saturation, Sharpness
You can set the Brightness, Contrast, Hue, Saturation,
Sharpness according to your preference.