Internal Interconnect Port Audio Line Out Pins

Hello Everyone,

A quick question regarding the internal interconnect port - does anyone know which pins are the audio line out?

I was looking at Jake Bordens’ breakout board image: http://retronewton.blogspot.com/2015/01/the-internal-interconnect-port.html

And see a soldering point for Sound In, but can’t see one for sound out. Also shouldn’t there be two points (pins) - one for the tip and one the sleeve of the plug? Or does one of the wires just connect to ground and so only one pin is connected to the interconnect port?

Thank you all in advance for your help.

Cheers,
Igor
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