Audio input and output at the same time

Hello mac users.
I have one simple question: since the new macbook has one single audio port for both input and output, how could I, for example, play my guitar AND listen to the headphones at the same time?
I KNOW (because I've tried) that with the iPhone headphones with microphone the port CAN physically work at the same time for input and output, so the question is: what can I use to do that? Will a simple splitter do or do I have to use different tricks?
(I know there is a thread on this already, but it doesn't provide a definitive answer)
Thank you!

One of the first questions to ask...
Is the audio input stereo or mono?
When using a headset mic you're dealing with a mono input so you at least know the Mac is capable of that.
If it's mono, and I suspect it is, should be easy to either make or purchase a custom cable that has two female input connectors, one mono input and a stereo headphone input.
However, I'd probably just purchase a USB audio interface, the sound, both recording and playback will be head and shoulders above the Macbooks built in internal audio.
pancenter-

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