April Music Stello DA100 - Manual (Page 9)

4.2 How to operate
1) Make sure that the level of your preamplifier or integrated amplifier set
to low volume level.
2) Turn the ‘Power’ Switch up (Red LED will lit).
3) Select your input by rotating the INPUT knob (COAX, OPT1, OPT2, USB).
4) Check if the ‘LOCK’ signal is on. If the ‘LOCK’ LED is not on even though
you set the knob for your selection, please check the wiring again for
proper connection.
5) Set the ‘UPSAMPLE’ lever switch either up position for ‘192’ upsampling,
or down position for ‘BYPASS’ mode. You can change this setting during
playing music.
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