I use MovAvi Screen capture studio has quite a few "extra" modules
built into it.  One is a simple Audio capture.....Anything your speaker hears it records.
  They have a 30 day trial with giant watermark.
Anything you can see and hear thru your speakers is recorded.
Of course one cannot see thru your speakers...LOL
Note my signature link...the older graphics videos were created with it.
BTW, no connection with them, just a happy fan.