This video shows some of the features of the Threnoscope system. In this instance the Threnoscope is an 8 channel system (the 8 lines drawn from the centre represent each speaker). You also see the the harmonics of a fundamental A (55Hz), i.e., 55, 110, 165, 220, etc. Later in the video you see how these harmonic lines are changed into a scale.
The Threnoscope is a descriptive score system, focusing on static music, or drones. Any music can be played with the system, but it is deliberately designed to encourage a certain way of thinking, where tunings, harmonics, harmonic beating, scales, and slow movements are emphasized. In short, the aim is to turn music into a synchronic medium, as opposed to a diachronic one. (An opposite direction taken from the painter Paul Klee, who tried to make painting timely).
The Threnoscope is a live coding score. The piece is ideally performed through writing code, but there are various ways in which hardware (such as MIDI keyboards) or GUI can be used to interface with the drones. Code, however, is the most effective and precise way of interacting with sound, and the system tries hard to resist the temptation to create GUI representation of, and controlling, the internal state.