Make sure to add FluidSynth wrapper.

.ipynb_checkpoints/app-checkpoint.py

@@ -4,6 +4,7 @@ import gradio as gr
 from musicautobot.utils.setup_musescore import play_wav
 from music21.midi.translate import midiFileToStream
 from pathlib import Path
+from midi2audio import FluidSynth
 
 def process_midi(midi_file):
     name = Path(midi_file.name)

app.py

@@ -4,6 +4,7 @@ import gradio as gr
 from musicautobot.utils.setup_musescore import play_wav
 from music21.midi.translate import midiFileToStream
 from pathlib import Path
+from midi2audio import FluidSynth
 
 def process_midi(midi_file):
     name = Path(midi_file.name)