{ config, lib, pkgs, ... }:
let

  library = import <library> { inherit pkgs lib; };

  mixxxBin = pkgs.writeShellScriptBin "mixxx"
  "${pkgs.mixxx}/bin/mixxx --settingsPath ${config.users.users.mainUser.home}/music-library/mixxx";
  mixxxDesktop = library.desktopFile mixxxBin { longName = "Mixxx"; };

  mixxxFreeBin = pkgs.writeShellScriptBin "mixxx-free"
  "${pkgs.mixxx}/bin/mixxx --settingsPath ${config.users.users.mainUser.home}/music-library-free/mixxx";
  mixxxFreeDesktop = library.desktopFile mixxxFreeBin { longName = "Mixxx"; };

in {

  system.custom.audio = {
    enable = true;
    sinks  = [
      {
        name  = "movieLimiterSink";
        queue = [
          {
            # compress all sounds
            plugin  = "dyson_compress_1403";
            label   = "dysonCompress";
            control = [
              "0"    # peak limit (dB)
              "1"    # release time (secons)
              "0.2"  # fast compression ration (unknown what that means)
              "0.8"  # compression ratio
            ];
          }
          {
            # limit sound
            plugin  = "fast_lookahead_limiter_1913";
            label   = "fastLookaheadLimiter";
            control = [
              "20"   # input gain (db)
              "-10"  # limit (db)
              "1.1"  # release time (s)
            ];
          }
          {
            # avoid deep sounds
            plugin  = "dj_eq_1901";
            label   = "dj_eq";
            control = [
              "-9"  # low  gain (db) (100Hz)
              "0"   # mid  gain (db) (1000Hz)
              "0"   # high gain (db) (10000Hz)
            ];
          }
        ];
      }
    ];
  };

  programs.custom = {
    easytag.enable = true;
    espeak.enable  = true;
  };

  environment.systemPackages = with pkgs; [
    audacious
    sox
    id3v2

    mixxxBin
    mixxxDesktop
    mixxxFreeBin
    mixxxFreeDesktop
  ];

}