ALL To DSD
In ALL To DSD mode, PCM will be converted to DSD output with promoted sound quality.
Notice: The All To DSD mode would increase more heat for the M15, and the battery life would be
relatively shortened a bit.
Adjustable volume at LO
This allows you to set whether the volume through Line Out can be controlled by
adjusting the volume level or not. The maximum volume would be the default value without
selecting the option.