I looked at the page you linked to. I'm not sure what that gizmo does. It's a two-to-one thing but I'm not sure what kind of two-to-one thing. And does it work with only an input (from a tape-player's output, for example)? And, by the way, the eSATAp connector doesn't fit on the T420. In general, I'm wondering why Lenovo doesn't make it easier to figure out how to connect to the computer's ports and jacks.