I'm a PC person. I found the solution under the Mac's system preferences. That USB could open up all kinds of music server options! Well, now I'm going to do some fun testing between the Mac/USB and my OPPO/digital coax.
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AvFan
Outlaw 976 | ATI 2005 | M&K 850s Left, Center & Right, Surround-55s, MX-70B Sub | Harmony 950 remote | Panamax 5100 | OPPO UDP-203 | LG OLED55B7