The pipe organ is history’s first additive synthesizer for timbre

Evidence

A pipe organ is one of the earliest forms of “additive synthesizer” for creating different sound timbres. In additive synthesis, the output sound is manipulated by means of adding harmonics together, and the stops of a pipe organ provide the means for this process. There are references to the existence of some form of pipe organ going back at least to 250 BC (Sumner, 1975). — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 1524

Categorization

• DEFINE: Additive synthesis is defined here as manipulating output by summing harmonics together.
• CANDY: The oldest known pipe organ references reach back to at least 250 BC — a good elevator fact.
• corroborated: 2 independent passages support this claim — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 1524
• XREF: connects to: Organ pipes’ timbre arises from resonances cooperating with edge tone; Organists shape timbre by selectively reinforcing harmonics of one series — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 1526; Pipe organ stops can reinforce non-octave harmonics to reshape timbre (+5 more)

Broader Connections

• Organists shape timbre by selectively reinforcing harmonics of one series #exemplifies (0.95) — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 1526
• Pipe organ stops can reinforce non-octave harmonics to reshape timbre #expands (0.92)
• Open and stopped organ pipes audibly start on different overblown harmonics #exemplifies (0.80) — David Howard, Jamie Angus, coustics and Psychoacoustics, 1471
• Each instrument’s timbre is defined by its unique recipe of harmonic partials #corroborates (0.75)
• Instrument timbre differences stem from harmonic spectra that shape masking breadth #corroborates (0.72) — Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 449
• Timbre is conditioned entirely by the strength and presence of overtones #corroborates (0.70) — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 1426
• A closed pipe’s first mode sits an octave below an open pipe’s #expands (0.70)