RS150B using as USB-DAC with CAS

Hi, I am trying to use USB port as input and all the audio source are on my computer as storage.
I would like to use RS150B as DAC of my computer to play audio or OS sound effect. However I have encountered 2 issues,

  1. when using USB-DAC as Input, there is no album /tag info when I am playing my audio with foobar, is there anyway that could achieve this? if no when in USB-in mode, is there anyway that I could connect to my PC as server and audio file in my PC storage, with RS150B as client to choose and play.
  2. when using USB-DAC as Input, I am not able to tune the volume through RS150B, is it essential to control it only on OS side? Is there any difference to the output Voltage which might affect the quality of the output signal?

Thanks in advanced