in xfreerdp where do i find valid values for /sound

Question

Reading the xfreerdp man page gives:

[sys][dev][format][rate][channel][latency][quality] as options for the /sound parameter.

Where can i find valid values for these options?

Here is the relevant section from the man page:

   /shell-dir
       Shell working directory

   /sound
       [sys][dev][format][rate][channel][latency][quality] - Audio output (sound)

   /microphone
       [sys][dev][format][rate][channel] - Audio input (microphone)

I have searched the wiki too, but that seems pretty outdated/not relevant:

https://github.com/FreeRDP/FreeRDP/wiki/Multimedia-Redirection

I've tried:

/sound:quality:10 and /sound:quality:high

but neither seem to have an effect.

I have found - mining the github issues repo, 17 seems to be valid for /format, and dynamic & high seem to be valid for quality

Please help?