Sound Mixer on Windows to mix sound over several output devices

Question

I am looking for software that primarily let me mix sound over all devices, sound-cards etc.

For example to have sound mixed over a blue-tooth headset and laptop speakers.

It should also be possible to see where which apps (Like SKype for example) want to send sound where.

(This seems to be a bit different from what one usually looks for in an audio mixer).

Anything within Audacity?

Answer 1

For Windows 7, Stereo Mix about like this: http://answers.microsoft.com/en-us/windows/forum/windows_7-sound/is-it-possible-to-have-speakers-and-hdmi-play-at/4563a5f8-4be4-4463-b312-eff594a9ae49

If not, then probably VAC (payware) from comment.

It might depend on audiocards and drivers.