diff --git a/fxrt_ws_probe.py b/fxrt_ws_probe.py
index a309b13..afe1fb5 100644
--- a/fxrt_ws_probe.py
+++ b/fxrt_ws_probe.py
@@ -254,6 +254,22 @@ async def run_ws_probe(port, chain, secs, stall):
 
     stall_state = {"until": 0.0}
 
+    async def param_burst():
+        # Mô phỏng fxRtPushAllParams (app gửi loạt set_param ngay sau WS open):
+        # numeric ParamID 0..3 → VST3 setParamNormalized THẬT trên bridge.
+        # Fix: setParam defer worker → audio loop không block → send interval ổn.
+        if not os.environ.get("FXRT_PROBE_PARAMS"):
+            return
+        await asyncio.sleep(0.8)
+        nslots = len(chain)
+        ids = [s.strip() for s in os.environ.get("FXRT_PROBE_PARAM_IDS", "0,1,2,3").split(",")]
+        for rep in range(4):
+            for slot in range(nslots):
+                for i, pid in enumerate(ids):
+                    await ws.send(json.dumps({"cmd": "set_param", "slot": slot,
+                                              "key": pid, "value": 0.3 + 0.1 * i}))
+            await asyncio.sleep(0.4)
+
     async def consumer():
         while not stop.is_set():
             if os.environ.get("FXRT_PROBE_CONSUMER_STALL") and \
@@ -280,7 +296,8 @@ async def run_ws_probe(port, chain, secs, stall):
     async with websockets.connect(ws_url) as ws:
         t0 = time.perf_counter()
         tasks = [asyncio.create_task(producer()), asyncio.create_task(pump()),
-                 asyncio.create_task(stall_scheduler()), asyncio.create_task(consumer())]
+                 asyncio.create_task(stall_scheduler()), asyncio.create_task(param_burst()),
+                 asyncio.create_task(consumer())]
         if os.environ.get("FXRT_PROBE_NO_CONSUMER"):
             for t in tasks:
                 t.cancel()