It's not easy to make a proper headphone jack (there is no power amp in the MD2 for a start), but you could stick a potentiometer at the audio output on the A/V port and put a 3.5mm socket there. It wouldn't be very loud though...
It could be possible to install a small amp to the inside of the Gen 2, although I don't think it'll fit. I had built a small stereo amp on a small 3.5" PCB, but even that wouldn't fit. I suppose it could be possible to make one on a much smaller board. You'd have to make your own traces though so that everything could be wired in a much smaller space. You'd have no problem hearing the sounds then.
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