[Bug 202062] audio/pulseaudio: New audio connection resets "mixer" to 75% volume.

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=202062

            Bug ID: 202062
           Summary: audio/pulseaudio: New audio connection resets "mixer"
                    to 75% volume.
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: gnome at FreeBSD.org
          Reporter: ken at pcbsd.org
             Flags: maintainer-feedback?(gnome at FreeBSD.org)
          Assignee: gnome at FreeBSD.org

General Description:
Occasionally when using the system and running a number of different apps
(audio/pithos, www/firefox with pulse enabled, others), the audio volume of the
system (as shown by the "mixer" utility) will get reset back to 75%. 
In particular, this seems to occur when a new application which uses PA is
started and/or a new audio stream/thread/(whatever the terminology is) is
created to output a sound from the app.

Example: 
1) Start pithos to listen to music.
2) Start Firefox and sign in to Slack
3) Get a notification on Slack and Firefox plays the little "ping" sound
 - as soon as the notification sound is about to play, the entire system volume
drops from 100->75% (as shown by "mixer"). 
However, any future notification sounds from Firefox (at least for the current
desktop session) do not modify the overall system volume again. This seems to
imply it is an issue with the first-time init routines for a PA stream not
taking the current system volume into consideration, but I have not been able
to track it down any more than that.

Versions (although this happened with older versions as well): 
pulseaudio: 6.0_2
Firefox: 39.0,1 (with Pulseaudio build option enabled)

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