Author Topic: Presentation of the Kraul Quarter-Tone Organ  (Read 4081 times)

0 Members and 1 Guest are viewing this topic.

organforumadmin

  • Administrator
  • Sr. Member
  • *****
  • Posts: 290
  • Karma: +22/-9
  • Organ Matters - Music - Building - Preservation
    • View Profile
Presentation of the Kraul Quarter-Tone Organ
« on: September 11, 2011, 01:18:08 AM »
Johann Sonnleitner


An Organ for Music in «Extended Tonality»*



Tuning: Concert pitch c = 128 Hz, a′ = 429 Hz.
Unequal temperament (Johann Sonnleitner)
Three fifths (c – g, g – d, d – a) 1/6 comma narrow,
Six fifths (a – e, e – h, h – f-sharp and e-flat – b-flat, b-flat – f, f – c)
1/12 comma narrow,
Three pure fifths (f-sharp – c-sharp, d-flat – a-flat, a-flat – e-flat).
From each of the 12 notes one tunes an «Alphorn-Fa» 11/8, giving a
nearly perfect 24-note cycle of harmonic fourths.
The pipes are arranged in third-seventh divisions to benefit the natural
sevenths 7/4 that are somewhat disadvantaged because of the quartertone
tuning.


* In «extended tonality» the major and minor scales after slight adjustments
in accordance with the proportions of the harmonic series from
the eighth to the 14th harmonic (in the major mode) and their inversion
(for the minor mode). Slightly tempering the exact mathematic relationships
makes enharmonic transformations possible.

David Pinnegar

  • Hero Member
  • *****
  • Posts: 1679
  • Karma: +66/-3
    • View Profile
Re: Presentation of the Kraul Quarter-Tone Organ
« Reply #1 on: September 13, 2011, 03:16:18 PM »
« Last Edit: September 15, 2011, 07:32:44 PM by David Pinnegar »
David Pinnegar, BSc ARCS

David Pinnegar

  • Hero Member
  • *****
  • Posts: 1679
  • Karma: +66/-3
    • View Profile
Re: Presentation of the Kraul Quarter-Tone Organ
« Reply #2 on: September 14, 2011, 06:20:35 PM »
David Pinnegar, BSc ARCS

 


Locations of visitors to this page

Organ Design


Latroba Holidays