I have a computer playing my mp3's through a Yamaha receiver and Boston speakers via the computer sound output in my study. My question, how do you send that signal to my Onkyo reciever into my AV room so I can listen to my mp3 library? I already have a signal wire between the two. Could you use the tape monitor out or video out from the Yamaha? Will it send current and fry my Onkyo?