The only option that is selectable is "Disabled" I had a look around, and this seems related to bug 325862. However, I am using phonon- gstreamer as a backend, so replay gain and the analyzer is supposed to work. Reproducible: Always Steps to Reproduce: Click on "Settings", then click on "Replay Gain mode" Actual Results: The bottom two options are greyed out Expected Results: All options to be available. At the very least, if this is a common error some sort of indication of what is wrong so that one can fix it. If there is a simple fix for this, I have not found it.
I can't reproduce this here, using a KDE4 installation and Amarok from git master. What exact system are you running? Amarok has a Diagnostics tool in the Help menu, that would help to get started, also which exact KDE release or Plasma version you are using would also be helpful.
Created attachment 98494 [details] Screenshot of my configuration Thanks for pointing me in the right direction. It turns out that this is not a bug with Amarok at all, rather it is with my setup. I'll document it here just so that anybody in the same situation would be able to solve it. I migrated to QT5 last year, but of course a lot of older software still requires QT4. So, I had both phonon-qt4-vlc and phonon-qt4-gstreamer installed. Since my desktop is QT5, I was unable to see/modify the QT4 backend in use. (Which Amaork picked up as VLC) So, I just un-installed phonon-qt4-vlc. Amarok no picks up both PulseAudio (Which has always been installed), and the Gstreamer backend. (I still don't know which one is being used QT4/5, but I don't really care.. it works beautifully) tl;dr - uninstall phonon-qt4-vlc