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Question 1. When I try to install from source I get the following error: wrong parameters to Project(), minimum project name and one language is required. How do I solve this?
Answer: Your version of Meson is too old. Try to install the latest one from the Python Package Index. See the official instructions for getting meson for more information.
Question 2. In PulseEffects versions older than 3.1.0 when I run the program and turn on the equalizer there are no level sliders shown, only one long horizontal slider with an ON/OFF switch.
Answer: You have Applications highlighted on the left of the screen and therefore have the volume control for the current running audio application and it's ON/OFF switch shown.
To show for example the Equalizer controls, you must click on the WORD Equalizer on the left.
Question 3. I have no sound in KDE although I can see the spectrum and the level meters changing.
Answer: KDE needs Pulseaudio's module module-device-manager that conflicts with PulseEffects. See #99. This issue will be fixed in the next Pulseaudio's version (probably version 12) but until then you will have to unload this module before running PulseEffects pactl unload-module module-device-manager.
Question 4. I do not use KDE but I also have no sound.
Answer: Unload the module module-switch-on-connect. See #99 to know why. This issue will be fixed in the next Pulseaudio's version (probably version 12) but until then you will have to unload this module before running PulseEffects pactl unload-module module-switch-on-connect.
Question 5. PulseEffects suddenly became the default output device.
Answer: Unload the module module-switch-on-connect.
Question 6. I have Lilv and Calf Studio installed but the Bass Enhancer and the Exciter do not work.
Answer: Delete the folder ~/.cache/gstreamer-1.0. Note: this should be fixed in Gstreamer 1.13.1
Question 7. Dark app theme doesn't work on KDE
Answer: Go to System Settings -> Application Style -> Gnome Application Style (GTK). Check the GTK themes to your theme of choice, PulseEffects will follow the theme you set here. Then reboot and open PulseEffects, it should match that theme. However, if you do not wish to have a dark theme as a global default for GTK, you can alternatively use a light theme that comes with a dark pair (e.g. Breeze and its pair Breeze Dark). This will enable PulseEffects to toggle the dark mode on.
Question 8. Whenever PulseEffects alternates between the playing and the paused state there is a memory leak
Answer: This is a bug in the Calf Limiter. I reported it to Calf developers and they fixed the leak https://github.com/calf-studio-gear/calf/issues/180#issuecomment-398786960. But until they release the next version you will have to use a package built directly from git.
Question 9. I can not enable effects for applications when using Deepin.
Answer: Try to disable audio from dconf (com.deepin.dde.daemon) and restart Deepin. See #240
Question 10 - I don't want to use the CSD (Client Side Decoration) that comes with PulseEffects.
Answer: You can install or compile gtk3-nocsd. You will still have the issue of having two windows titles so to solve this you can apply this hack.