I am on Windows 7 and I have a monitor with audio capabilities connected via HDMI on the graphics card, a couple of speakers connected to the rear panel as well as a Bluetooth Headset.
I use a program called audio switcher to easily switch between the 3. I am also familiar with VLC being able to select the audio device while having another audio device playing something different.
The question is how can I simultaneously use 2 or all 3 audio outputs to play the same thing?
