Gee this is getting a bit deep
Firstly to record directly from a mic into a sound card with a quality result you will need to buy a sound card costing £1200+ (ask anyone who has been on music technology course) most spend a lot more.
This clouds the issue, no one has said you cant use your method, it works but not with quality
The subject was a new device that enables people to connect a turntable or cd player ect directly into there computer with a quality result and minimum fuss