DTS:X APO4 + DTS Interactive, easy read guide updated,
here. I included 'Win CAudio', which will increase audio quality and reduce latency.
If you have already installed and are setup, disable the audio services and apply, shutdown the PC for 5 mins.
Admin console: net stop dtsapo4service & net stop audiosrv & net stop audioendpointbuilder
You only need to run 'Win CAudio' once per Windows install, not per pack.
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Highest latency with the pack (just DTS, and E-APO upmixer) will be
buffer latency.
More on loopback recording,
here.