Seriously, it's really easy, buy an op-amp, look at the schematic of it, wire the inputs to the L and R on the AV, then take 5v and ground from the AV port or the PSU, then attach the phono socket on the outputs of the op-amp IC. Simple.
search in the hardware forum for a 'VGA tutorial' that will show you where you solder for L and R, look at the dots pic, dots 3 and 2 are sound, look at the circuit schematic - it tells you which pin is what.
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