Modified the app.

app.py

@@ -30,11 +30,15 @@ def synthesise(text):
     speech = outputs["waveform"]
     return speech
 
+# converting the output audio array to int16,which is expected by gradio
+target_dtype = np.int16
+max_range = np.iinfo(target_dtype).max
 
 def speech_to_speech_translation(audio):
     translated_text = translate(audio)
     synthesised_speech = synthesise(translated_text)
-    synthesised_speech = (synthesised_speech.squeeze().numpy() * 32767).astype(np.int16)
+    # converting for gradio
+    synthesised_speech = (synthesised_speech.squeeze().numpy() * max_range).astype(np.int16)
     return 16000, synthesised_speech