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Can I then get everything what is played by all applications on this device. Like fetch and send through the network? (Not pushing audio to the main out.)

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You can do that on systems that support it, like JACK and PulseAudio.

So Linux only?

I guess it would be a pretty unique addition to have a method to grab the main mix on Windows, Linux, and OS X in a common way!

Some Windows drivers had a "Stereo Mix" device under Recording to grab the currently playing audio. There's also http://software.muzychenko.net/eng/vac.htm but it really needs a FOSS competitor.

Right, so on systems with "Stereo Mix" device, you could use libsoundio to capture from it.

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