https://forums.freebsd.org/threads/snd_uaudio-pcm-device-volume-not-modifiable.88800/
[snd_uaudio] PCM device volume not modifiable | The FreeBSD Forums
Hi, I have a gaming headset (Steelseries Arctis 7) which has two devices - one for main sound (game sound) and another for chat sound (lower quality) and...
sndpcmdevicevolumemodifiable