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?