OK, I have some mixed progress to report with the latest MB build. DSD files still sound like white noise when output=ASIO, but my DAC is recognizing a DSD file. However, then MB locks up, and won't play anything (PCM or DSD). Here is the sequence of steps I ran:
play 44.1 PCM (OK)
play DSD64 (DAC recognizes DSD, white noise playback, MB locks up. I have to kill MB, disconnect and reconnect my DAC, and re-start MB to play music again).
Also, this is probably not important now, but MB is sending DSD64 and DSD128 files as DSD64.
Let me know if I can provide any additional information.
P.S. if output = WASAPI, MB converts DSD to 88.2 PCM (and they play just fine)