Jinx! will record the default capturing device which is activated within your windows installation. You can control this inside the sound/audio options in the windows control panel. If your audio source is within the same pc (e.g. you are playing your music with winamp/media player or whatever on the same pc) you have to activate a loop back on your sound card to capture the master out. Not every soundcard (driver) has such an option, if your sound card doesnt support this you have to use a additional software like vb-cable: http://vb-audio.pagesperso-orange.fr/Cable/