[Shinaz Bakar]

I have a better solution, it works for me (adobe audition v3).
A. In windows OS, go to control panel, sounds, then recording/input, check “stereo mix” as default input.

B.
1)Open audition, choose edit from the menu, then choose audio hardware setup.
2)Then, select multitrack view tab and click on control panel.
3)Next, under “DirectSound Input Ports, check “Stereo Mix”, and click on “Move Up” to make sure it says “Yes” for Sync Reference, click “OK”.
4)In Multitrack View, make sure default input is “stereo mix”.
5) Apply, OK.

Let me know if you have problems understanding this. It worked for me.