diff --git a/scripts/led-matrix-viz.py b/scripts/led-matrix-viz.py
index 89ef3e6..b76f445 100755
--- a/scripts/led-matrix-viz.py
+++ b/scripts/led-matrix-viz.py
@@ -135,7 +135,7 @@ def main():
                             params = render(active_notes)
                             if params != last_sent_params:
                                 msg_id = (msg_id + 1) % 65535
-                                pending_bytes = packer.pack([0, msg_id, "draw_frame", params])
+                                pending_bytes = packer.pack([2, msg_id, "draw_frame", params])
                                 last_sent_params = params
 
         # Try to send pending frame — no POLLOUT dependency
@@ -155,7 +155,7 @@ def main():
             fps_sample_frames += 1
             if last_sent_params is not None and pending_bytes is None:
                 msg_id = (msg_id + 1) % 65535
-                refresh_bytes = packer.pack([0, msg_id, "draw_frame", last_sent_params])
+                refresh_bytes = packer.pack([2, msg_id, "draw_frame", last_sent_params])
                 router, ok = try_send(router, refresh_bytes)
                 if ok:
                     frames_sent += 1