Do not install pavucontrol on non-graphical installs.

nix/configuration/hosts/neelix/default.nix

@@ -29,4 +29,5 @@
   me.graphics_card_type = "intel";
   me.kodi.enable = true;
   me.lvfs.enable = true;
+  me.sound.enable = true;
 }

nix/configuration/hosts/odo/default.nix

@@ -49,5 +49,6 @@
   me.python.enable = true;
   me.qemu.enable = true;
   me.rust.enable = true;
+  me.sound.enable = true;
   me.sway.enable = true;
 }

nix/configuration/roles/sound/default.nix

@@ -8,69 +8,85 @@
 {
   imports = [ ];
 
-  environment.systemPackages = with pkgs; [
+  options.me = {
-    pavucontrol
+    sound.enable = lib.mkOption {
-  ];
+      type = lib.types.bool;
-
+      default = false;
-  # rtkit is optional but recommended
+      example = true;
-  security.rtkit.enable = true;
+      description = "Whether we want to install sound.";
-  services.pipewire = {
-    enable = true;
-    alsa.enable = true;
-    alsa.support32Bit = true;
-    pulse.enable = true;
-    # If you want to use JACK applications, uncomment this
-    #jack.enable = true;
-
-    extraLv2Packages = [ pkgs.rnnoise-plugin ];
-    configPackages = [
-      (pkgs.writeTextDir "share/pipewire/pipewire.conf.d/99-input-denoising.conf" ''
-        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
-                    # Optionally specify a specific input: (ID from `pactl list`)
-                    # target.object = "alsa_input.usb-Shure_Incorporated_Shure_Digital-00.analog-stereo"
-                }
-                playback.props = {
-                    node.name =  "rnnoise_source"
-                    media.class = Audio/Source
-                    audio.rate = 48000
-                }
-            }
-        }
-        ]
-      '')
-    ];
-  };
-
-  environment.persistence."/persist" = lib.mkIf (!config.me.buildingIso) {
-    hideMounts = true;
-    users.talexander = {
-      directories = [
-        ".local/state/wireplumber" # Sound settings
-      ];
     };
   };
 
+  config = lib.mkIf config.me.sound.enable (
+    lib.mkMerge [
+      {
+        # rtkit is optional but recommended
+        security.rtkit.enable = true;
+        services.pipewire = {
+          enable = true;
+          alsa.enable = true;
+          alsa.support32Bit = true;
+          pulse.enable = true;
+          # If you want to use JACK applications, uncomment this
+          #jack.enable = true;
+
+          extraLv2Packages = [ pkgs.rnnoise-plugin ];
+          configPackages = [
+            (pkgs.writeTextDir "share/pipewire/pipewire.conf.d/99-input-denoising.conf" ''
+              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
+                          # Optionally specify a specific input: (ID from `pactl list`)
+                          # target.object = "alsa_input.usb-Shure_Incorporated_Shure_Digital-00.analog-stereo"
+                      }
+                      playback.props = {
+                          node.name =  "rnnoise_source"
+                          media.class = Audio/Source
+                          audio.rate = 48000
+                      }
+                  }
+              }
+              ]
+            '')
+          ];
+        };
+
+        environment.persistence."/persist" = lib.mkIf (!config.me.buildingIso) {
+          hideMounts = true;
+          users.talexander = {
+            directories = [
+              ".local/state/wireplumber" # Sound settings
+            ];
+          };
+        };
+      }
+      (lib.mkIf config.me.graphical {
+        environment.systemPackages = with pkgs; [
+          pavucontrol
+        ];
+
+      })
+    ]
+  );
 }