Sound issues with Virtualbox Guests

I have sound working fine on 11.2-RELEASE-p4 with kde5 using the Phonon VLC backend as well as on the cli as expected. The only thing even moderately out of the ordinary is that I have selected a USB DAC for output. (hw.snd.default_unit=3). However, whenever vritualbox (virtualbox-ose-5.2.22_1 from pkg) tries to open /dev/dsp it does not work and logs the following.

00:00:54.299025 OSS: Failed to open /dev/dsp: Operation not supported (45)

I haven't had any luck searching for this issue and hope someone here may have an idea.

Cheers!
 
OSS is selected is selected by default, I recompiled the port with Pulse enabled and audio works if Pulse is selected but I'd much prefer to be able to use the binary package.
 
Does that mean OSS sound is not usable from virtualbox guests? I don't get sound neither from a windows nor a linux guest. Otherwise sound is working perfectly on the FreeBSD host.
 
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