When starting the tool I get the following output:
$ fs2_equaliser
/usr/bin/fs2_equaliser:1040: wxPyDeprecationWarning: Call to deprecated item.
wx.InitAllImageHandlers()
alsa_output.pci-0000_00_03.0.hdmi-stereo
Module module-combine-sink not loaded.
Every time I change a setting or apply a preset it repeats the last line Module module-combine-sink not loaded. and I hear no effect, even with the most extreme presets.
Okay, the message seem irrelevant. I just had first start the equalizer and then afterwards Spotify. Now the equalizer works. Thank you!