diff --git a/tts/tts_audio_handle.py b/tts/tts_audio_handle.py
index 7c09d31..79eacf1 100644
--- a/tts/tts_audio_handle.py
+++ b/tts/tts_audio_handle.py
@@ -14,7 +14,7 @@ class TTSAudioHandle(AudioHandler):
     def __init__(self, context, handler):
         super().__init__(context, handler)
         self._sample_rate = 16000
-        self._index = 1
+        self._index = -1
 
     @property
     def sample_rate(self):
@@ -41,20 +41,33 @@ class TTSAudioSplitHandle(TTSAudioHandle):
         self.sample_rate = self._context.sample_rate
         self._chunk = self.sample_rate // self._context.fps
         self._priority_queue = []
+        self._current = 0
         logger.info("TTSAudioSplitHandle init")
 
     def on_handle(self, stream, index):
         # heapq.heappush(self._priority_queue, (index, stream))
         if stream is None:
             heapq.heappush(self._priority_queue, (index, None))
-
-        stream_len = stream.shape[0]
-        idx = 0
-
-        while stream_len >= self._chunk:
-            self.on_next_handle(stream[idx:idx + self._chunk], 0)
-            stream_len -= self._chunk
-            idx += self._chunk
+        else:
+            stream_len = stream.shape[0]
+            idx = 0
+            chunks = []
+            while stream_len >= self._chunk:
+                # self.on_next_handle(stream[idx:idx + self._chunk], 0)
+                chunks.append(stream[idx:idx + self._chunk])
+                stream_len -= self._chunk
+                idx += self._chunk
+            heapq.heappush(self._priority_queue, (index, chunks))
+        current = self._priority_queue[0][0]
+        print('TTSAudioSplitHandle::on_handle', index, current, self._current)
+        if current == self._current:
+            self._current = self._current + 1
+            chunks = heapq.heappop(self._priority_queue)[1]
+            if chunks is None:
+                pass
+            else:
+                for chunk in chunks:
+                    self.on_next_handle(chunk, 0)
 
     def stop(self):
         pass
diff --git a/tts/tts_base.py b/tts/tts_base.py
index 067e2fe..a81a59c 100644
--- a/tts/tts_base.py
+++ b/tts/tts_base.py
@@ -45,11 +45,15 @@ class TTSBase(NLPCallback):
         self.message(txt)
 
     def message(self, txt):
+        txt = txt.strip()
+        if len(txt) == 0:
+            logger.info(f'message is empty')
+            return
         logger.info(f'message:{txt}')
-        print(f'message:{txt}')
         index = 0
         if self._handle is not None:
             index = self._handle.get_index()
+            print(f'message txt-index:{txt}, index {index}')
         self._message_queue.add_task(self._request, txt, index)
 
     def stop(self):
diff --git a/ui.py b/ui.py
index f4388c8..200eb29 100644
--- a/ui.py
+++ b/ui.py
@@ -37,7 +37,7 @@ class App(customtkinter.CTk):
 
         # configure window
         self.title("TTS demo")
-        self.geometry(f"{1100}x{580}")
+        self.geometry(f"{1150}x{580}")
 
         self.grid_columnconfigure(1, weight=1)
         self.grid_rowconfigure((0, 1), weight=1)
@@ -88,7 +88,7 @@ class App(customtkinter.CTk):
         self._canvas.pack(fill=customtkinter.BOTH, expand=customtkinter.YES)
 
     def _render(self):
-        after_time = 29
+        after_time = 24
         try:
             image = self._queue.get(block=True, timeout=0.003)
             if image is None:
@@ -155,7 +155,6 @@ class App(customtkinter.CTk):
 
     def on_render(self, image):
         self._queue.put(image)
-        print('on_render', self._queue.qsize())
 
 
 if __name__ == "__main__":