@Xuanqian, would it be possible to make setting of output a preference? So that it falls back to Digital output, if my preferred USB DAC is powered down or unplugged?
In my scenario i have a Nagra HD DAC connected to the USB DAC output of my Aries G1. On the digital outputs i have an Audiobyte Black Dragon as well as my preferred headphone amp, the Moon 430HAD. When i sit down to really listen to music, i power up the Nagra, but at other times, when i just want some good sounding music, i turn on the Audiobyte.
Problem is i have to dig into the menys and Additional Operations of the Aries if i used the USB output the last time.
Why not make the Aries default to a usable output, if your preferred output is not available?