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If you can, try to make the video louder. I really had to crank up the volume to listen to it. (Probably use a combination of normalize and compress in Audacity.)

Cool hack!

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I think the speaker is too big and / or the circuit doesn't have an amplifier, so that would be an improvement; the USB power supply should have enough juice left over to crank up the volume.

Mostly, my mistake was I had the phone too far away - notice in the video that when I get it close, it sounds just fine.

Live and learn :-)

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