nix-conf/modules/audio/default.nix

{ pkgs, ... }:
{
  security.rtkit.enable = true;

  services.pipewire = {
    enable = true;
    #systemWide = true;
    alsa = {
      enable = true;
      support32Bit = true;
    };
    pulse.enable = true;
    jack.enable = true;

    wireplumber.enable = true;
  };

  hardware.pulseaudio.enable = false;

  environment.etc = {
    "pipewire/pipewire.conf.d/rnnoise.conf".text = ''
context.modules = [
{   name = libpipewire-module-filter-chain
    args = {
        node.description =  "Noise Canceling source"
        media.name =  "Noise Canceling source"
        filter.graph = {
            nodes = [
                {
                    type = ladspa
                    name = rnnoise
                    plugin = ${pkgs.rnnoise-plugin}/lib/ladspa/librnnoise_ladspa.so
                    label = noise_suppressor_mono
                    control = {
                        "VAD Threshold (%)" = 50.0
                        "VAD Grace Period (ms)" = 200
                        "Retroactive VAD Grace (ms)" = 0
                    }
                }
            ]
        }
        capture.props = {
            node.name =  "capture.rnnoise_source"
            node.passive = true
            audio.rate = 48000
        }
        playback.props = {
            node.name =  "rnnoise_source"
            media.class = Audio/Source
            audio.rate = 48000
        }
    }
}
]
    '';
  };
}