Originally Posted by Shedevils

What? You can plug a mic or a mic/headphone combo into the 1/8 inch multifunction audio on the back. See:
audio - MacBook Pro (mid-2012) Microphone Input - Ask Different

But truthfully Apple is correct and you would want to use an external setup for the sake of quality. On the PCs we use here we always disable the onboard sound chip in BIOS and use an external DAC or encoder for audio.