More formtting fixes

interface.py

@@ -211,7 +211,8 @@ def create_ui():
                         voice = gr.Dropdown(
                             label='Voice',
                             choices=default_voices,
-                            value=default_voices[0][0]
+                            value=None,
+                            allow_custom_value=True
                         )
                     
                     with gr.Column():
@@ -223,7 +224,8 @@ def create_ui():
                         model = gr.Dropdown(
                             label='AI Model',
                             choices=default_models,
-                            value=default_models[0][0]
+                            value=None,
+                            allow_custom_value=True
                         )
                 
                 submit_btn = gr.Button('Create Podcast', variant='primary')