How the hell do I hook up a Sega CD

[Chojin]

There's a port on the side of the genesis that plugs into the Sega CD. hook power to both devices and turn the genesis on with no cart in it, and the Sega CD loader will appear.

The mixing port is an input for stereo sound from a 1/8" TRS connector (normal headphone plug), so if you have a type 1 genesis you can run a cable from 'headphones' to 'mixing' in order to get stereo sound (gen mk.1 only outputted audio in mono from its rear outputs).