As a child, Glenn Gould enjoyed practicing the piano as his mother vacuumed. The sounds of piano were all but obscured by the additional noise, resulting in Gould's brain filling in the ambiguous sensory information with ideal models of what the piano would be expected to sound like.
In performances of the Closed-circuitry ...for Violoncello and Harmonics, ...for Trio and Harmonics, ...for Quartet and Harmonics, ...for Piano and Harmonics, and ...for and Quintet Harmonics. Particularly when played through a surround-sound system, the audience member's position in the room determines which and how these waves (both of the instruments and the sines) will be combined, some cancelled, some re-enforced. The audio output of the computer is a stream of noise comprised of two elements, pitches and sine frequencies. The pitches are performed by an internal MIDI synthesizer available to Java. In that a violin voice playing a middle-C and a clarinet voice playing a middle-C differ in timbre, the spectrum of overtone frequencies.