add step=1

app.py

@@ -78,7 +78,7 @@ demo = gr.Interface(
     inputs=[
         gr.inputs.Audio(type="filepath"),
         gr.inputs.Audio(source="microphone", type="filepath"),
-        gr.Slider(minimum=7, maximum=21)
+        gr.Slider(minimum=7, maximum=21, step=1)
     ],
     outputs=['image', 'image', 'image', 'text', 'text', 'text', 'text'],
     # examples=examples,