Which asound.conf

Hi everyone.
I’m running mopidy on a Raspberry Pi 4 Model B Rev 1.2.
Everything works fine, except for the fact that I can’t understand what to do with asound.conf in order to run alsamixer equalizer: if I don’t use asound.conf the equalizer does not work, if I use the one I paste below (I have found it somewhere online, I have no idea of what it means, but reference to sound card are correct), equalizer works, but the sound is crap and distorted.

The output directive in section audio in mopidy.conf is set to alsasink when I don’t use asound.conf, and alsasink device=equal when I use it.

Does anyone can help to set the correct asound.conf for my soundcard? This is the output of aplay -l:

**** List of PLAYBACK Hardware Devices ****
card 0: IQaudIODAC [IQaudIODAC], device 0: IQaudIO DAC HiFi pcm512x-hifi-0 [IQaudIO DAC HiFi pcm512x-hifi-0]
  Subdevices: 0/1
  Subdevice #0: subdevice #0

and this is \etc\asound.conf

pcm.!default {
  type plug
  slave.pcm plugequal;
ctl.!default {
  type hw card 0
ctl.equal {
  type equal;
pcm.plugequal {
  type equal;
  slave.pcm "plughw:0,0";
pcm.equal {
  type plug;
  slave.pcm plugequal;

Thank you very much!

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