Simultaneous Audio Playback via multiple audio devices
For example you have embedded audio via a black magic deck link card and want to do playback simultaneously using another soundcard (for example audio output via ASIO USB devices). This function would open up possibilities in playback and production surroundings using different ways and outputs. Having the option of only one output can be quite limiting.
Matt Stegner commented
This is possible, but not with ASIO. ASIO specification is control by a separate company other than Adobe and has some limitations.
This is possible in MME. It is also possible with a 3rd party software too, like ASIO4All.