last code had ui , but not working as expected

app.py

@@ -1,54 +1,43 @@
 import logging
-from typing import cast
 from pdfminer.high_level import extract_text
-from huggingface_hub import hf_hub_download, list_repo_files
-import gradio as gr
+from huggingface_hub import hf_hub_download
 from balacoon_tts import TTS
+import gradio as gr
 
 # Global TTS module, initialized from a selected model
 tts = None
-speakers = []
-default_speaker = None
 
 def read_pdf(file):
     text = extract_text(file.name)
     return text
 
-def synthesize_audio(file, speaker_str):
+def synthesize_audio(file):
     text_str = read_pdf(file)
     if len(text_str) > 1024:
         text_str = text_str[:1024]
-    samples = tts.synthesize(text_str, speaker_str)
+    samples = tts.synthesize(text_str)
     return (samples, tts.get_sampling_rate())
 
 def main():
     logging.basicConfig(level=logging.INFO)
     file_input = gr.inputs.File(label="Upload PDF")
 
-    model_files = list_repo_files(repo_id="balacoon/tts")
-    model_name_dropdown = gr.inputs.Dropdown(label="Model", choices=model_files)
-
-    def set_model(model_name_str: str):
-        model_path = hf_hub_download(repo_id="balacoon/tts", filename=model_name_str)
-        global tts, speakers, default_speaker
-        tts = TTS(model_path)
-        speakers = tts.get_speakers()
-        default_speaker = speakers[-1]
-
-    speaker_dropdown = gr.inputs.Dropdown(label="Speaker", choices=speakers)
+    model_name = "balacoon/tts"  # Set the desired model name here
+    model_path = hf_hub_download(repo_id=model_name)
+    global tts
+    tts = TTS(model_path)
 
     audio = gr.outputs.Audio(label="Generated Audio", type="numpy")
 
-    def generate_audio(file, model_name_str, speaker_str):
-        set_model(model_name_str)
-        return synthesize_audio(file, speaker_str)
+    def generate_audio(file):
+        return synthesize_audio(file)
 
     iface = gr.Interface(
         fn=generate_audio,
-        inputs=[file_input, model_name_dropdown, speaker_dropdown],
+        inputs=file_input,
         outputs=audio,
         title="PDF TO SPEECH CONVERTER",
-        layout="rows",
+        layout="vertical",
         debug=True
     )