Under song playing status and with the first long “4;TONE” button press for bass adjustment, the second long press the “4;TONE” button(highlighted in red) is for treble adjustment.(within 4s)
Rotate the volume control knob left/right to turn up/down the volume for treble accordingly within 4s after button press. Or it would switch to the normal volume control.
NOTE: The LED will be flashed as indicator as rotating to the MIN or MAX.
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