[Freeswitch-users] Recording with music (playing in background)

Hi all, I am new freeswitch user. I need to record the user voice/songs with music that selected earlier and this music plays in background . That is results comes as mix up of both songs i.e music in background and voice records in foreground . I want to dedicate this mix up file to other user.. Can I patchup these two files seperately..into one file ? or simultaneouly do recording with playing music in background ......and if so ..then please guide me..how can i do it ? Any help will be highly appreciated. Thanks .