Some music players require additional configuration to support audio processing.
- Go to Settings - Audio engine - Advanced tweaks and enable MusicFX
- Go back to the music player and open the equalizer settings by pressing the second item in the bottom bar
- Go to the second (middle) page and enable the MusicFX button
- Go to Settings - Audio Hardware - and enable DSP Effect (Device)
- Press confirm at the bottom right to save the setting.
- Press the 3-dots menu in the upper right corner and open Settings - Audio
- Press Equalizer to use and choose the second option: 'System Equalizer'
- Press the hamburger menu and open settings
- Press Audio - Select Equalizer and select Default Equalizer
- Play some music
- In the bottom left corner, open sound settings
- Under the Equalizer category, enable 'Activate' and press OK
This list is exhaustive. Suggestions are welcome.