Hi,
Firstly, check the audio signal at this point:

This can be done with headphones. Or you can use the included speaker but the sound is very quiet.
Hi,
Check the solder pin12 of the Pi. Also short pins of variable resistor as a picture
I'm posting the board back to him as it seems to be non-functional
After such an assembly the Picicle can not work:
If I post a circuit, will it help you?
Of course. The chip LM4871 is not properly soldered - rotated 180 degrees.
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