Found a site that said that some Windows OS cannot switch to a DAC from the Win audio output while a music browser is running. I shut off the Musicbee, and then turned it on again. It worked! The output goes through my DAC now.
I think Gibosi told me about this little DAC a couple of years ago.
Anyhow, this is what I have on hand. My objective was to find out if I could decrease the hum from my PC by using an external DAC.
So how did my experiment go? The answer is that the hum is somewhat lower with this device but it is still noticeably there. My laptop, chromebook and CD player make much less hum, down to a tolerable level.
In conclusion only a slight improvement and not meeting my objectives. Now I just have to figure out if the sound from the DAC is better than the built in Win sound card....And I better not trip on that wire connecting the DAC across the floor in my room!