diff --git a/LongCat/nodes.py b/LongCat/nodes.py
index d066d5b5..c3a35c0d 100644
--- a/LongCat/nodes.py
+++ b/LongCat/nodes.py
@@ -295,7 +295,31 @@ def linear_interp(features, output_len):
                 offset += w.shape[-1]
             out_audio = {"waveform": mixed, "sample_rate": sr}
 
-        return (multitalk_embeds, out_audio, num_frames)
+        # Calculate actual frames based on audio duration
+        actual_num_frames = num_frames
+        if len(audio_outputs) > 0:
+            if multi_audio_type == "para":
+                # For parallel mode, use the longest audio duration
+                max_audio_duration = max([ao["waveform"].shape[-1] / sr for ao in audio_outputs])
+                actual_frames_from_audio = int(max_audio_duration * fps)
+            else:  # "add"
+                # For sequential mode, use the total audio duration
+                total_audio_duration = sum([ao["waveform"].shape[-1] / sr for ao in audio_outputs])
+                actual_frames_from_audio = int(total_audio_duration * fps)
+            
+            # Use the smaller of requested frames or actual audio frames
+            actual_num_frames = min(num_frames, actual_frames_from_audio)
+            
+            if actual_frames_from_audio < num_frames:
+                log.info(f"[LongCat] Audio duration ({actual_frames_from_audio} frames) is shorter than requested ({num_frames} frames). Using {actual_num_frames} frames.")
+
+        # Debug: log final mixed audio length and mode
+        total_samples_raw = sum([ao["waveform"].shape[-1] for ao in audio_outputs])
+        log.info(f"[LongCat] total raw duration = {total_samples_raw/sr:.3f}s")
+        log.info(f"[LongCat] multi_audio_type={multi_audio_type} | final waveform shape={out_audio['waveform'].shape} | length={out_audio['waveform'].shape[-1]} samples | seconds={out_audio['waveform'].shape[-1]/sr:.3f}s (expected {'sum' if multi_audio_type=='add' else 'max'} of raw)")
+
+
+        return (multitalk_embeds, out_audio, actual_num_frames)
 
 
 NODE_CLASS_MAPPINGS = {
@@ -305,4 +329,4 @@ def linear_interp(features, output_len):
 NODE_DISPLAY_NAME_MAPPINGS = {
     "WanVideoLongCatAvatarExtendEmbeds": "WanVideo LongCat Avatar Extend Embeds",
     "LongCatAvatarWhisperEmbeds": "LongCat Avatar Whisper Embeds (v1.5)",
-    }
\ No newline at end of file
+    }