Hi Doug/Robski,
I bought a commercial 4 pole "TRRS" cable to cut down, as Peter suggested in previous post, but ended up NOT using it. As Paul and Jeremy pointed out a standard 3 pole "stereo" plug will fit into the Pi audio socket and connect with the L and R audio channels, which is all that is needed.
I guess you will have completed your "audio" installation by now, but this post is intended to help others;
You can purchase 3.5 mm 3 pole "stereo" cable sockets from Maplins cheaply, (most towns have a branch, usually situated next door to Halfords). It is easy to solder a cable to it and heat shrink over the cable and connector body to insulate and ruggedise your work.
NB. This socket had two other advantages, it comes with a nut, so it can also be used as a bulkhead connector for fitting to a panel, and the insertion/ pull-out force is high for a plugged in cable, just what you want for an "in-line" connection if this will be a feature of your set-up. I would use this socket over their "open frame" bulkhead socket, any day!
Rather than purchase standard jack to jack audio cables, I bought the "SLIM 3.5mm" variety, via eBay. These are much neater, and will fit into iPad or phone headphone sockets with no problems. They are also much cheaper than Maplin, who only supply the big body jacks on their made up cables.
Regards,
Chris
