The Max Neuhaus and John Cage piece performs additive synthesis before the listener. It starts with an almost inaudible tone that gradually collects other signals and evolves into a richer sound. The timbre of this sound is dynamic, varying from full and vibrant to disjoint and metallic. The panning gives the piece movement and a sinister atmosphere. The other noises that emerge, oscillating low frequencies and a piercing beep, accentuate the ominous imagery evoked by the music.
“The Synthesis of Synthesis- The Telharmonium” elaborates on Thaddeus Cahill’s invention, the Telharmonium. It moves electrons in the same fashion as air molecules do when handling sound energy. It can therefore replicate the entire sound spectrum digitally.
Wendy Carlos’s compositions make significant use of synth pads to generate full sounds. Sometimes, she creates disharmony, possibly to convey a darker feeling. Given that this is a movie soundtrack, it is natural that the music adapts to the scene on the screen. Other analogue instruments are incorporated as well, maybe echoing the human-computer interaction depicted in Tron. The range of frequency of sounds is very wide across the entire sound track. This helps to separate the pieces into discrete layers.
James Tenney’s piece is similar to that of Neuhaus and Cage in that it performs additive synthesis. It differs in its panning, which is generally balanced, and in its atmosphere. The signals are added gradually and are mostly homogeneous. The piece evokes a feeling of floating.
The members of Huun Huur Tu create a rich, room-filling sound with only their voices. There is an audible second frequency overlaying the fundamental of each note they sing. It is most apparent with their bass, or lowest voice. The voices mix almost seamlessly with the string instruments they play.