Replace --osc-enable with --osc-play

- Add --osc-play with optional file argument
- If no file provided, defaults to output/output_chords.json
- Fix python-osc API (addr -> address)
- Keep --fundamental, --osc-ip, --osc-port

src/io.py

@@ -355,9 +355,11 @@ def main():
         help="Show analysis statistics after generation",
     )
     parser.add_argument(
-        "--osc-enable",
-        action="store_true",
-        help="Enable OSC output for real-time playback",
+        "--osc-play",
+        nargs="?",
+        const="output/output_chords.json",
+        default=None,
+        help="Enable OSC playback (optionally specify chord file, default: output/output_chords.json)",
     )
     parser.add_argument(
         "--osc-ip",
@@ -379,6 +381,21 @@ def main():
     )
     args = parser.parse_args()
 
+    # Handle OSC playback mode (separate from generation)
+    if args.osc_play:
+        from .osc_sender import OSCSender
+
+        chords_file = args.osc_play
+        sender = OSCSender(
+            ip=args.osc_ip, port=args.osc_port, fundamental=args.fundamental
+        )
+        sender.load_chords(chords_file)
+        print(f"OSC playback from: {chords_file}")
+        print(f"Destination: {args.osc_ip}:{args.osc_port}")
+        print(f"Fundamental: {args.fundamental} Hz")
+        sender.play()
+        return  # Exit after OSC playback
+
     # Select dims
     if args.dims == 4:
         dims = DIMS_4

src/osc_sender.py

@@ -45,7 +45,7 @@ class OSCSender:
             frac = Fraction(pitch["fraction"])
             freq = self.fundamental * float(frac)
             addr = f"/freq"
-            msg = osc_message_builder.OscMessageBuilder(addr=addr)
+            msg = osc_message_builder.OscMessageBuilder(address=addr)
             msg.add_arg(voice_idx + 1)  # Voice number (1-indexed)
             msg.add_arg(freq)  # Frequency
             self.client.send(msg.build())