Sound capturing on SB using "What you hear"

[Pszemus]

I need help 'bout the sound capturing through Sound Blaster Live. In
system (Widows) mixer there's a "What you hear" option (as an input). I
found some help how to capture microphone sound using mixer, DataLine,
TargetDataLine (I can paste some source) but there's no info about
changing TargetDataLine to something else than microphone...
Can anyone please tell me how this can be done.