There's a merged pull request on the void-packages repository

Use sndio as first preference in PortAudio, enable PortAudio for spotifyd
https://github.com/void-linux/void-packages/pull/23838

Description:
If sndio isn't available, spotifyd, using the portaudio backend, falls back to ALSA cleanly. However, in the previous version, with sndio enabled, the portaudio backend simply didn't output anything. Therefore, I believe my change to the patch makes sense.

Enabling portaudio for spotifyd makes sense because it allows one to use sndio without requiring alsa-sndio.

@Johnnynator and @abenson