I'm currently traveling, on my Christmas holiday, but when I get back home (06-JAN-19), I can look on my home PC, and provide the info.
There is one caveat about using V4A on the DP-X1 - if the V4A driver is installed/enabled, then UAPP will not operate in HiRes or Bit Perfect mode, due to driver conflicts.
If the V4A driver is enabled, and UAPP "Internal Audio Driver" is set to "HiRes Direct Driver", it doesn't work, and displays "Failed to find or setup HiRes DAC!".
If the V4A driver is enabled, and UAPP "Internal Audio Driver" is set to "Original Android Driver", and "Internal HiRes Audio > Bit Perfect Mode" is not set to "Off", then the audio that does play is very distorted.
Unfortunately, switching the V4A driver On/Off requires installing/uninstalling the driver, and rebooting - so you can't simply click a setting to switch between using the Original Android Driver & V4A, or using the UAPP HiRes driver.