The window appears. The controls are adjustable. Settings can be applied, but the app has no affect on the sound.
Are you set to the correct ouput sink/device???
When installing pulseaudio-equalizer you also install LADSPA because it is used
Also the equalizer is not being developed thus may or may not work
There is no option to set the device in the equalizer but I have sound, just no tone controls.
I put in ladspa. Unfortunately it didn’t help.
If you are using KDE then try moving up the LADSPA Plugin to the top of the audio device list. You can do this by navigating to Systemsettings > Multimedia > Audio and Video, or with the command:
Don’t forget to “Apply Device List to …” all.
I think you got it with that one.