anchor.diff:        '';
       };
   
  -    users.extraGroups= { audio = { }; };
  +    users.extraGroups= { audio = {}; };
     };
   }
  
positive.code: 
      services.udev = {
        packages =
          if cfg.ffado.enable then
            [ pkgs.ffado ]
          else [ ];
  
        extraRules = ''
          KERNEL=="rtc0", GROUP="audio"
  
negative.code:       kernel.sysctl = { "vm.swappiness" = 10; };
  
        kernelModules =
          if cfg.alsaSeq.enable
            then [ "snd-seq"
                   "snd-rawmidi"
                 ]
            else [];
  
        kernelPackages = let
          rtKernel =
  