Secor and Hermann Pedtke's Motorola Scalatron (1974) is a Bosanquet generalized keyboard featuring a multicolored arrangement of 240 tunable oval keys, about which Secor said: "There is not much point in using this alternative keyboard for systems below 31 tones in the octave." However, "even if it were completely impractical musically, it would make a wonderful prop for a futuristic movie." Though its synthesizer capacities may not reach performance level, according to Easley Blackwood, "It has rock-steady tuning capabilities; you can always count on it to be right."
Secor[edit | edit source]
In music, a secor is the interval of 116.7 cents ((18/5)(1/19)) Play (help·info) named after George Secor. Secor devised it to allow a close approximation, generated from a single interval, to Harry Partch's 43 tone just intonation scale. All 11-limit consonances are approximated to within 3.32 cents.
Two secors (233.4 Play (help·info)) approximate an 8:7 interval (231.17), a septimal whole tone. Three of these 8:7 intervals (693.51), or six secors (700.2 Play (help·info)), approximate a fifth (701.96). A neutral third of 11:9 (347.41) is approximated by three secors (350.1 Play (help·info)).
Miracle temperament[edit | edit source]
In music, miracle temperament is a regular temperament discovered by George Secor in 1974 which has as a generator an interval, called the secor, that serves as both the 15:14 and 16:15 semitones. Because 15:14 and 16:15 are equated, their ratio 225:224 '"`UNIQ--postMath-00000001-QINU`"' is tempered out, and two secors give an 8:7 interval, a septimal whole tone. Three of these 8:7 intervals, or six secors, make up a fifth, so that 1029:1024 '"`UNIQ--postMath-00000002-QINU`"' is also tempered out. This gives the seven-limit version of miracle.
A septimal whole tone of 8:7 as we have seen is approximated by two secors, and a neutral third of 11:9 by three secors. In miracle, a minor third plus a septimal whole tone is also equated with the 11th harmonic. This means that the gap between a minor third plus a septimal whole tone '"`UNIQ--postMath-00000003-QINU`"' and the 11th harmonic (an 11:8 ratio), 385:384 '"`UNIQ--postMath-00000004-QINU`"'., is also tempered out. Miracle, therefore, is the temperament tempering out 225:224, 1029:1024 and 385:384 at the same time.
For tuning purposes, a secor of seven steps of 72 equal temperament can be used. While this also tempers out 4375:4374 (the ragisma), doing this is not regarded as a part of the definition of miracle temperament.
Miracle temperament, particularly in the ten note Miracle scale ( Play (help·info)) and the distributionally even scale known as Blackjack ( Play (help·info)). The twenty-one note Blackjack scale is derived from twenty successive secors and has been used by several composers, including New York composer Joseph Pehrson.
- s is a secor, q is the difference between 10 secors and 1 octave, and r is the difference between s and q. If the Miracle scale is
0 1 2 3 4 5 6 7 8 9 0' s s s s s s s s s s +q q +r q +r q +r q +r q +r q +r q +r q +r q +r q +r +q
- then the Blackjack scale is
0 >0 1 >1 2 >2 3 >3 4 >4 5 >5 6 >6 7 >7 8 >8 9 >9 <0 0' q r q r q r q r q r q r q r q r q r q r q
this may also be viewed as a chain of 20 secors:
>0 >1 >2 >3 >4 >5 >6 >7 >8 >9 0 1 2 3 4 5 6 7 8 9 <0 s s s s s s s s s s s s s s s s s s s s
References[edit | edit source]
- Barbieri, Patrizio (2008). Enharmonic: Instruments and Music 1470-1900; revised and translated studies, p.96. Il Levante Libreria Editrice. ISBN 9788895203140.
- Vail, Mark (2000). 9780879306038, p.101. Backbeat Books. ISBN 9780879306038.
- "Secor", TonalSoft.com. Accessed: July 2013
- "Miracle Temperaments", Xenharmony.
Further reading[edit | edit source]
- Secor, George (1975). "A New Look at the Partch Monophonic Fabric" Xenharmonikon 3. Frog Peak, N.H. Located at Selected papers of George Secor.
[edit | edit source]
- "George+Secor", Xenharmonic wiki.
- "Miracle Temperaments", Graham's Website: Intonation Information. Accessed: July 2013
- " The Motorola Scalatron ", The Motorola Scalatron on "120 years Of Electronic Music"
YouTube Videos[edit | edit source]
- Youtube search for: gNFK6PxgmRk
See for instance
- Motorola Scalatron George secor plays the Scalatron. The Scalatron was an unusual microtonal electronic instrument developed in the early 1970s by Motorola as a new venture into the instrument market. Promoted as the ‘first instant-performance instrument that plays in the cracks’ the Scalatron was aimed squarely at a more experimental, microtonal market – if such a market existed. The instrument itself was a rather basic synthesiser consisting of 240 square wave oscillators (one for each key) built into a wooden home-organ casing.
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