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Volume Down and Up buttons (The volume control only applied for XLR and RCA output ) : 1. After powering on the NFB-9, immediately after the display has flashed "NFB-9" three times and flashed the display as last power off ,
A , If you push and hold the "volume down" button for one second, the NFB-9 will forget the volume level set before you last powered off and set the volume at zero.
B, If you push and hold the "volume up" button for one second, the NFB-9 will be at the volume it was last set to before the power was switched off.
C, If you push and hold the "flavors" button for one second, the NFB-9 will be at the volume on 2.5V output level ( The standard DAC output level ).
2. Push once for the volume to go up or down 1 step.
3. Push and hold to make the volume go up or down quickly.
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Although I would caution Kingwa with using the world "Monster"
"To achieve Silent operation, the control circuit is powered with separate regulator.
Monster grade power supply. "
http://www.audio-gd.com/Pro/dac/NFB9/NFB9EN.htm