Public bug reported:

>From the Sound design for Touch (https://wiki.ubuntu.com/Sound#Phone),
we need to change the default behaviour of the indicator in order to be
able to change volume per audio roles, and not only the master volume.

On touch the master volume will always be at 100%, and each media role
will have its own volume values, so we can have a different volume level
for multimedia, ringtone and alarms.

This can be done using the streamrestore module in pulseaudio (via another dbus 
entry point that is only enabled on touch atm):
http://www.freedesktop.org/wiki/Software/PulseAudio/Documentation/Developer/Clients/DBus/StreamRestore/

There's also a sample script on python that can be used to set/get volume per 
roles:
https://raw.githubusercontent.com/jusa/pulseaudio-utils/master/pasr.py

And the current roles supporter by touch are: multimedia, alert, phone
and alarm.

** Affects: indicator-sound (Ubuntu)
     Importance: High
         Status: Confirmed


** Tags: rtm14 touch-2014-09-25

** Tags added: rtm14 touch-2014-09-25

** Changed in: indicator-sound (Ubuntu)
       Status: New => Confirmed

** Changed in: indicator-sound (Ubuntu)
   Importance: Undecided => High

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https://bugs.launchpad.net/bugs/1368827

Title:
  [touch] indicator needs to be able to control volume per audio role

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