The Singing Machine STVG888W Instruction Manual page 14

Operation
Using a Bluetooth Device
am
al
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BALANCE: Balance allows you to
eliminate the lead singer's voice by
rotating the knob to the left when
playing a multiplex recording, or
eliminate the music by rotating the
knob to the right.
Note: When playing a music-only recording,
the balance will shift to the right or left
speaker.
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Press the POWER ON/OFF button to
the out position to turn the unit off.
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