I only listed 8 but one is NC (not connected?) and one has no pin on it.
You're right about the jumpers.
It looks as if I can't have both the rear m/b audio connectors working AND the front ones at the same time; it's either one or the other which seems pretty stupid to me. Or can I get rid of the jumpers and have both front and back connectors working?
No ... when you connect the front cables they replace the jumpers and your rear sockets work until you plug headphones in the front which disconnects the rear sockets and cuts the speakers off ... just like a normal audio set up.
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