Add gradio demo app

app.py

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+import numpy as np
+import gradio as gr
+
+# gradio generate tone example
+
+notes = ["C", "C#", "D", "D#", "E", "F", "F#", "G", "G#", "A", "A#", "B"]
+
+def generate_tone(note, octave, duration):
+    sr = 48000
+    a4_freq, tones_from_a4 = 440, 12 * (octave - 4) + (note - 9)
+    frequency = a4_freq * 2 ** (tones_from_a4 / 12)
+    duration = int(duration)
+    audio = np.linspace(0, duration, duration * sr)
+    audio = (20000 * np.sin(audio * (2 * np.pi * frequency))).astype(np.int16)
+    return sr, audio
+
+demo = gr.Interface(
+    generate_tone,
+    [
+        gr.Dropdown(notes, type="index"),
+        gr.Slider(4, 6, step=1),
+        gr.Textbox(value="1", label="Duration in seconds"),
+    ],
+    "audio",
+)
+if __name__ == "__main__":
+    demo.launch()
+

requirements.txt

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+wheel
+paderbox
+padertorch
+onnxruntime
+TTS
+torchdiffeq