[tobik]

I realize I'm replying to a 2 weeks old comment, so nobody will read this ever, but from your list sndio supports: streaming audio over a network, user-land mixing of audio sources, mixing of multiple audio streams at the same time, and per application volume settings.

> Per application input/output source settings

No, but the input/output device is selectable per application via the AUDIODEVICE environment variable.

> bluetooth audio devices

OpenBSD has no bluetooth support, so no. I'm also wondering why the kernel wouldn't create audio devices from these that the userland daemon can then just transparently use? Does an audio daemon need special support for bluetooth audio devices?

The sndio daemon has more features. Give the man page a read if you're interested: http://man.openbsd.org/OpenBSD-current/man8/sndiod.8