One option for more volume would be to change the LM380 audio amp to an LM386. There are only 3 pins in common, but 3 others are just offset one hole and could be easily done by hand. Add a 10 uF cap across the remaining two pins, and you've got 12 db more gain than the original. You might even save a couple of mA, since the quiescent drain is lower.
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