@rich.e I’m not sure I’m following you. Perhaps because I’m not taking your original statement literal enough. You wrote
AFAIK there is no way to utilize two audio devices at the same time from the same process (application), on any platform.
and perhaps what you mean is claiming ownership of two audio devices simultaneously? I interpreted that as no application being able to supply two different audio devices with output.
I’m not too wise on audio libraries, having only worked with them for a few years.