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#15923 (Linux hosts OSS audio driver support broken in ...
https://www.virtualbox.org/ticket/15923
While the host OSS v4 sound driver used to work just fine with VirtualBox till and including v5.0, v5.1 cannot work with it any more; only ALSA and Pulseaudio still work. When starting a VM with OSS as the host-side sound driver configured, I get the following message: "Some HDA audio streams (PCM Input) could not be opened.
PulseAudio - Wikipedia
https://en.wikipedia.org/wiki/PulseAudio
The modern implementation, Open Sound System v4, provides software mixing, resampling, and changing of the volume on a per-application basis; in contrast to PulseAudio, these features are implemented within the kernel. PulseAudio support in OpenIndiana and other illumos distributions relies on the in-kernel OSS implementation ("Boomer"). See also
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