I have a 2015 MBP Retina 15". I need to (for my radio show) pull audio off of my TV once in a while. I have RCA's coming out of my satellite receiver that plug into a 'y ' cable that terminates to a 3.5mm plug. This worked for my old MBP (2009) but doesn't seem to work with the new one. I'm plugging into the mic/headphone jack here. Do I need a special plug/cord? Or do I have to use something like a Griffin iMic?