Sound Issues

[Flavor]

You can pretty easily do that "step 4" thing by popping your SD card out of the Pi, inserting it into your PC/Mac, and editing the file. It's on the "boot" partition, and that's easily usable on any PC.

I don't see any obvious solder problems. The pin and pad on the top-left looks slightly uncovered, but I think it's still making good contact.

I think that after your case mod around the volume wheel and adding "audio_pwm_mode=2" to /boot/config.txt, you will have nice audio.

If you don't, definitely let us know. All the systems we've built do have some "white noise" in the menu system, but the games sound good.

If the headphones sound good, that should mean that the volume wheel and the connections to the Pi are good. If the speaker still has problems after that, then there could be a problem with the amplifier chip or the related components. I think that we've encountered one GPA that had a problem like that one time. It needed a small repair.