Techniques are described for real-time converting audio into digital musical notation. In an implementation, the process receives a sequence of samples of an audio stream in real time. Based on the sequence of samples, the process generates a window set of note event probability values. The process excludes from the window set of event probability values a leading set of event probability values and a trailing set of event probability values, thereby generating a filtered window set of event probability values. Based on the filtered window set of event probability values, the process determines a sequence set of note-on and note-off events.