I have succesfully made my USB soundcard the default output option and it works well. I am now wondering how to play music from my phone into the mic input of the soundcard and then output the music through the soundcard's output. After i figure that out, the goal is to analyze the music and hopefully make a spectrum analyzer.
For now, i just simply want it to work as a sort of cable extender with the pi as the middleman. Any ideas about how to set this up?