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Specifically in Windows (Windows 8 in my case), a multi-monitor setup using HDMI can have multiple sound systems (such as one per monitor), but they are independent of each other by default, and only one is enabled at any given time.
I'm wondering if it's possible for a single process to use all sound systems, by either playing the relevant sound through all sound systems or by controlling the balance between how much sound is played by each.
I'm NOT looking for hardware solutions, such as a splitter cable or similar. I'm looking for either a piece of software, a configuration option, or another software technique that can accomplish this. I would prefer a general solution for different versions of Windows, but it's not necessary.
The goal in the end is to have somewhat of a "shell" application that processes the outgoing sound from every running application and outputs it to one or many sound systems depending on certain conditions.
I'm not sure if this is possible, but it would be great if it is. Thanks.