Kolmarp

Help guys, i am like a poor man using No cable launcher for plauing rocksmith, and i wanted to play with my friens in multiplayer, i connected cables with Jack–Minijack into computer, one in inline, second into microphone, and launcher says player 1 and player 2 have the same input device ids make it different otherwise multiplayer wont work How can i fix this? I don't have any interfaces because i am poor LOL, i connect cables using built-in sound card Please help