How do you disable volume control on MSB Discrete DAC

It’s in the Menu section. From the manual:

(Startup volume)
 0 - 100 (Default 70)
• The startup volume can be adjusted from 0 - 100 or disabled
Off
• In this mode, the volume control is disabled
Note: If you choose to use the DAC with an external preamp, we recommend turning the volume control off. To do this, turn the knob past 100 to “off”

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MSB Customer Support suggested the following settings for my MSB Premier DAC:

1) DAC to Integrated Amp (using a pre-amp)

DAC Output level = high

DAC volume = 96-98

COMMENTS: I switched the DAC Volume back and forth between 96 and 98. I do not notice a sound difference but decided to keep the DAC volume control at 98.

2) DAC to power amplifier (Direct to power amplifier):

DAC Output level = low

DAC volume = Start at 0, increase as needed.

I hope this helps. If you have more questions, please contact MSB Customer Support.