diff --git a/hosts/earth/configuration.nix b/hosts/earth/configuration.nix
index 52b5dc4..4663799 100644
--- a/hosts/earth/configuration.nix
+++ b/hosts/earth/configuration.nix
@@ -55,6 +55,30 @@
   # Enable CUPS to print documents.
   services.printing.enable = true;
 
+  services.pipewire.extraConfig = {
+    pipewire = {
+      pw-modules = [
+        {
+          name = "module-loopback";
+          args = {
+            source = "alsa_input.pci-0000_0d_00.4.analog-stereo";
+            sink = "alsa_input.pci-0000_0d_00.4.analog-stereo";
+          };
+        }
+      ];
+    };
+
+    # } = [
+    #   {
+    #     name = "module-loopback";
+    #     args = {
+    #       source = "alsa_input.pci-0000_0d_00.4.analog-stereo";
+    #       sink = "alsa_input.pci-0000_0d_00.4.analog-stereo";
+    #     };
+    #   }
+    # ];
+  };
+
   # Enable sound with pipewire.
   sound.enable = true;
   hardware.pulseaudio.enable = false;