I have a macbook and are getting the new iMac. I want to use the same headphones for both machines at the same time. Ideally I would like to plug the macbook's audio out into the iMac's microphone, and the a headset into the iMac respectively. The problem is, my headset is 3.5mm and the new iMac only has 1 3.5mm port instead of 2 like older iMacs. I've tried a USB adapter to give me additional 3.5mm jacks, but they're very static sounding and generally unreliable. Does anyone know of a way to send audio out from my macbook to my iMac and have it go to my headphones plugged into the iMac?