Do you know how Windows† Store apps can talk to APOs?
Windows Store Apps are "sandboxed" to ensure that they cannot communicate with most other functions on the computer, and that includes general control of APOs.
Optimal has researched this issue long and hard, and we have created reliable mechanisms for communication between Windows Store apps and the audio stack, including APOs. There are different mechanisms for HD Audio and USB Audio.
Contact us to find out more.