Speco Technologies VM22TSLCD - Manual (Page 9)

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Volume: Controls built- in speakers’ output volumes.
Bass: Adjusts the tone to low frequency part of the sound.
Treble: Adjust the high or acute of the sound.
Balance: Adjusts the softness of loudness of notes in the sound.
Mute: To disable the audio function. To enable, press MUTE again.
Touch Panel LCD: OSD-Audio Setting