Cello C 1997F Instruction Manual page 16

Use the and buttons to select the SOUND menu(as the picture above), press
menu.
Sound Mode Allows you to select among: Standard, Music, Movie, Sports and User.
Treble(Can be adjusted when the sound mode is User)
Controls the relative intensity of higher pitched sounds.
Bass(Can be adjusted when the sound mode is User)
Controls the relative intensity of lower pitched sounds.
Balance To adjust the balance of the left and right sound track, or turn off the volume of the
left and right sound track.
Auto Volume Control the volume of the program automatically when you turn on the function by
selecting "On".
Surround Sound Turn on/off the surround sound function by selecting "on"/"off".
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button to enter the