tree-wide change. seperated config from 'real' modles.

configs/nixos/sound.nix

@@ -0,0 +1,23 @@
+{
+  config,
+  pkgs,
+  ...
+}: {
+  # Enable sound with pipewire.
+  sound.enable = true;
+  hardware.pulseaudio.enable = false;
+  security.rtkit.enable = true;
+  services.pipewire = {
+    enable = true;
+    alsa.enable = true;
+    alsa.support32Bit = true;
+    pulse.enable = true;
+  };
+
+  home-manager.users.${config.host.user} = {config, ...}: {
+    home.packages = with pkgs; [
+      pwvucontrol
+      helvum
+    ];
+  };
+}