I believe your questioner was specifically referring to your assertion that audio on Alpine is unusually good. It is a somewhat odd observation, since ALSA is entirely a kernel API and Alpine is using the same kernel as everyone else. The only possible source of audible difference would be not running Pulseaudio, which resamples audio (some say, badly). However, you can install Pulseaudio on Alpine, and you can not-install Pulseaudio on most anything else, so it wouldn't really be fair to call that a feature of Alpine.