In the KDE Volume Settings app -> audio volume -> advanced, it says it needs module-gconf to use those options. I've looked in the software center and dev center and couldn't find it. From what I can tell its a compile time option for PulseAudio. (But I could be wrong.)
Open source & license LGPL
@sunnyflunk since your packaging KDE for Solus I thought you'll be the best to tag in this.