fixed bugs, fixed sample inputs

app.py

@@ -29,20 +29,18 @@ def main():
   st.markdown(title, unsafe_allow_html=True)
 
   sample_files = {
-    'None': '',
     'Stewie Griffin': 'sample_inputs/stewie.wav',
     'Donald Trump': 'sample_inputs/trump.wav',
     'Joe Rogan': 'sample_inputs/rogan.wav'
   }
 
   # Upload audio file
-  uploaded_file = st.file_uploader('Add an audio file of the voice you want to clone...', type=['wav'])
-  selected_sample = st.selectbox('Or choose a sample:', list(sample_files.keys()))
+  uploaded_file = st.file_uploader('Add an audio (.wav) file of the voice you want to clone...', type=['wav'])
+
+  if uploaded_file is None:
+    selected_sample = st.selectbox('Or choose a sample:', list(sample_files.keys()))
   
-  if selected_sample is not 'None':
-    speaker_file = sample_files[selected_sample] 
-  if uploaded_file is not None:
-    speaker_file = uploaded_file
+  speaker_file = uploaded_file if uploaded_file is not None else sample_files[selected_sample]
 
   if speaker_file:
     st.header('Reference Audio')