This question comes up from time to time. For state of the art high-end DAC design, this is an irrelevant question.
This FAQ explains the DAC's volume control:
https://nuprimeaudio.com/ufaqs/what-kind-of-volume-control-and-preamp-do-you-use-for-your-dac/First of all, what is "bypass" ? It is not like there is a mechanical switch where you can toggle to do some sort of bypass. Any electronics bypass require at least some passive parts and opamp.
If the volume control works like a switch resistor ladder, then bypass is unnecessary because the each volume setting works like a switch.
The analog input goes directly to the "switch" and you can simply set it at a fixed volume - that's your bypass. The volume setting will be remembered even if you turn off the DAC.
The digital inputs, obviously must go through the DAC (and therefore bypass is irrelevant).
In the early DAC-10 design, we had a bypass mode (which is effectively setting the volume at 0 db) and then user would accidentally switched to the "bypass input" and caused a loud pop. That feature was eventually removed, by simply not allowing to fixed the volume.
