Made a cable to switch between aux and CD changer. Basically just separates the audio left and right from the CD change cable to a 6 pole switch.
The issue was that i couldn't get the semi proprietary female and male sockets and used regular 8 pins instead.
Unfortunately the hackjob sockets are a bit finicky so I don't think it'll hold together too well with actual driving. I also made the cable a few cms shorter than ideal length?
However at the moment it works well and the switch instantly switches between CD and aux. the sound is the best auxiliary input sound I've heard for the stock setup(I've hard wired into sc805 in other car, used tape ad peters etc.).