sndioctl output.mute=1 does not mute PC speaker beep

Hi misc@,

Not 100% sure this is a bug, but it feels like it is. Not sure if it's
my audio driver or if this is universal.

If I do sndioctl output.level=0, I don't hear any PC speaker beeps, like
the terminal beeps (\a).

If I do sndioctl output.mute=1, while output.level is greater than 0, I
hear the beeps.

Is this intentional? I certainly find it confusing.

Thanks!

-Henrich