Don't overlook the latest alternative on the software audio cable scene,
VB-Cable: http://vb-audio.pagesperso-orange.fr/Cable/

Naturally I found out about it the same week my latest QST article
arrived in the mailbox ;-) or I would added it to the list.

But it works well, is much simpler than VAC yet sufficient for most ham
uses, and the basic version is free. A nice alternative for those of
us whose soundcards do not support Stereo Mix.

73, Bob W9RAN