This is the Qt port of pavucontrol <https://freedesktop.org/software/pulseaudio/pavucontrol/>.

The original authors of the gtk+ version of pavucontrol are:
* Copyright 2006-2009 Lennart Poettering
* Copyright 2009-2011 Colin Guthrie <mzcnihpbageby (at) 0pointer (dot) de>

The Qt port pavucontrol-qt is derived from the gtk+ version.
It's done by LXQt developers:
* Copyright 2016 Hong Jen-Yee (PCMan) <pcman.tw@gmail.com>
