The purpose of piano-chart is to allow developers to include visual representation of musical notes on a piano keyboard. See it "in action" at PianoShow.me. All you need to do to display your notes on ...
sound = np.sin(2 * np.pi * note_freq * time) * np.exp(-0.0004 * 2 * np.pi * note_freq * time) sound += np.sin(2 * np.pi * 2 * note_freq * time) * np.exp(-0.0004 * 2 ...
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