Resetting the resampler and audio output settings (and setting the hi-res output back up) didn't make a difference, but what did was disabling DVC.
With DVC disabled, and setting the ouput sample rate to 96KHz, I do now hear sound out of the DAC. However, there is still a discrepancy between the sample rates in the output chain. It looks like if you choose a sample rate > 48KHz the PA outputs at 384KHz.
The other thing I notice is that the sample rate indicator LED on the device is acting odd. I've attached an image from the manufacturers documentation.
My testing:
- Start with the hi-res sample rate "defined by device".
- Plug in DAC. Play music. Device LED is green.
- Set sample rate to 96KHz. Device LED turns blue (?!). I also notice that the bit-depth automatically changes to 32-bit (in the hi-res settings).
- After this, changin the sample rate to any value (including 41 and 48), the device LED remains blue (?!).
This would suggest that the device thinks it is outputting at 176 or 192KHz. i.e. disagreeing with PA. Something seems wrong.
Hope this helps.