diff --git a/.env b/.env
index 9585771..2843be9 100644
--- a/.env
+++ b/.env
@@ -1,8 +1,9 @@
 # Lighting Controller Configuration
 CONTROL_SERVER_URI=ws://localhost:8765
+CONTROL_SERVER_HOST=0.0.0.0
 CONTROL_SERVER_PORT=8765
 TRANSPORT=spi
-AUDIO_INPUT_DEVICE=7
+AUDIO_INPUT_DEVICE=1
 MIDI_TCP_HOST=127.0.0.1
 MIDI_TCP_PORT=65432
 SOUND_CONTROL_HOST=127.0.0.1
diff --git a/.env.example b/.env.example
index fd8bdb2..7e82863 100644
--- a/.env.example
+++ b/.env.example
@@ -15,6 +15,11 @@ CONTROL_SERVER_URI=ws://10.42.0.1:8765
 # For custom IP (if your Pi has a different address):
 # CONTROL_SERVER_URI=ws://YOUR_PI_IP:8765
 
+# Control server WebSocket host (bind address)
+# 0.0.0.0 = listen on all interfaces (allows external connections)
+# localhost or 127.0.0.1 = listen only on localhost (local only)
+CONTROL_SERVER_HOST=0.0.0.0
+
 # Control server WebSocket port
 CONTROL_SERVER_PORT=8765
 
@@ -29,7 +34,7 @@ TRANSPORT=spi
 # Sound Detection Configuration
 # ==============================
 # Audio input device index (use sound.py to list available devices)
-AUDIO_INPUT_DEVICE=7
+AUDIO_INPUT_DEVICE=1
 
 # MIDI TCP configuration
 MIDI_TCP_HOST=127.0.0.1
diff --git a/src/control_server.py b/src/control_server.py
index 4beeb07..b187a69 100644
--- a/src/control_server.py
+++ b/src/control_server.py
@@ -376,10 +376,11 @@ class ControlServer:
 
     async def start_websocket_server(self):
         """Start WebSocket server for UI clients."""
+        host = os.getenv("CONTROL_SERVER_HOST", "0.0.0.0")
         server = await websockets.serve(
-            self.handle_ui_client, "localhost", CONTROL_SERVER_PORT
+            self.handle_ui_client, host, CONTROL_SERVER_PORT
         )
-        logging.info(f"WebSocket server listening on localhost:{CONTROL_SERVER_PORT}")
+        logging.info(f"WebSocket server listening on {host}:{CONTROL_SERVER_PORT}")
 
     async def run(self):
         """Run the control server."""