How to record internal audio for the destop?

[longer]

Sorry if this is a rookie or irrelevant question, but I really ain't got the time to browse through all those posts. So I'm gonna ask anyway: How to record internal audio for the destop? Thanks in advance.

[Traviscotch]

This post is deleted!

[Pl45m4]

@longer

There's actually a Qt Example for this. Have a look here
Check out the QAudioRecorder-class in general

EDIT:

It seems that QAudioRecorder records from microphone source only, but IIRC it's possible to set Windows output as virtual mic input