Using both internal Realtek and Mbox2 Mini interface simoultaneously
 

I would take alive a musical track from youtube or similar that comes out from headphone outlet of computer that goes in the input of my Digidesign Mbox2 Mini to register it on Pro Tools 10. I work on Windows 7, I cannot choose for youtube the internal interface Realtek of Windows, because appears only the Digigidesign Mbox2 Mini interface the works both for youtube and ProTools. Do you think that buyng another interface (as a Mbox Mini or a RME Fireface UC) and using one for youtube and the other for ProTools could solve the problem? And how I could drive the exit of youtube on one specific interface? thanks
niky