I've been trying to work out the Jriver issue, I should ask here as well.
I was using Jriver prior to the DA8. However, with MC19, I can't seem to get DSD to play, I've tried all sorts of things but failed in succeeding. In the DA8 manual, it states that wasapi EVENT should be used, but EVENT mode isn't there. Apparently if exclusive mode is selected, that would mean that event mode is being used. But I still cannot play a DSD file. Maybe someone can shed some light?
Alternatively, out of frustration--I went back to foobar and followed the instruction for ASIO. DSD plays perfectly, the DA8 screen shows "input USB DSD". Not only does DSD work, but I'm getting excellent sound quality with DSD as well as all the formats.
I had no problems with MC19 (and MC18) playing DSD. WASAPI Event Style is default but can be disabled on the "Device Settings".
I got DSD working with WASAPI (event style not disabled) or Kernel Streaming and Bitstreaming/Custom/DSD over PCM (DoP) and DSP Studio Output Format disabled.
I also got it working with ASIO and Bitstreaming/Custom/DSD but this way JRiver will not play any PCM source unless you set Output Encoding to 2xDSD on Studio Output Format that upsamples any PCM file to 2xDSD.
A third way to get MC19 playing DSD is selecting foo_dsd_asio as the output device. The foo_dsd_asio must be set to encode DSD as DoP. Bitstreaming can be either DSD or DoP.
As I told before, my MC19 (and MC18) does not play PCM files if the output device is set to DA8 ASIO, however foobar2000 plays. Does any one else have the same problem?