diff --git a/fxrt_ws_probe.py b/fxrt_ws_probe.py
index afe1fb5..cb3d89c 100644
--- a/fxrt_ws_probe.py
+++ b/fxrt_ws_probe.py
@@ -25,8 +25,8 @@ BLOCK = 256
 BATCH = 4
 BATCH_PERIOD = BATCH * BLOCK / SR       # 21.333ms
 BLOCK_PERIOD = BLOCK / SR               # 5.333ms
-FILL = 24
-CAP = 48
+FILL = 48
+CAP = 64
 HOLD = 2                                # block lặp khi underrun (~10.7ms)
 
 IZ = r"C:\Program Files\Common Files\VST3\iZotope"