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DAC+ Zero no sound

Yet another "no sound post". I've read through the configuration guide and all of the old forum posts with no luck.

I'm running the Hifi Berry Raspbian Lite build with a Pi 3 B+ and a DAC+ Zero plugged directly into the GPIO pins.

All of the configuration instructions went well (seemingly), but I get no sound. I can see volume controls in `alsamixer` and `amixer` but when I play audio with `play -n synth sine 1000` or `aplay audio_file` I don't hear anything. What are some good next debugging steps?

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