Getting more idomatic nix modules setup... will tackle users dir later

modules/audio_pulse.nix

@@ -0,0 +1,25 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+with lib;
+let
+  name = "audio_pulse";
+  cfg = config.mods.${name};
+in
+{
+  options = {
+    mods.${name} = {
+      enable = mkEnableOption (lib.mdDoc "Enable ${name}");
+    };
+  };
+
+  config = mkIf cfg.enable {
+    # Enable sound.
+    hardware.pulseaudio.enable = true;
+    hardware.pulseaudio.package = pkgs.pulseaudioFull;
+    environment.systemPackages = [ pkgs.pavucontrol ];
+  };
+}