ayatana-indicator-sound 0.8.1-2 (amd64 binary) in ubuntu impish

 This Ayatana Indicator is designed to be placed on the right side of a
 panel and give the user easy control over the system's sound settings.
 .
 Ayatana Indicator Sound provides easy control of the PulseAudio sound
 daemon, and integrates well with media players that support the Mpris
 protocol.
 .
 Ayatana Indicators are only available on desktop environments that
 provide a renderer for system indicators (such as MATE, XFCE, Lomiri,
 etc.).