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In stretched tuning, two notes an octave apart, whose fundamental frequencies theoretically have an exact 2:1 ratio, are tuned slightly farther apart (a stretched octave). If the frequency ratios of octaves are greater than a factor of 2, the tuning is stretched; if smaller than a factor of 2, it is compressed." [3]
English: Correctly labeled modifier keys for the ANSI Keyboard layout. This diagram includes denotations for the common form factors for 60%, 80%, and 100% sized keyboards. Key sizes are also correct, relative to each other, based on the 1x model.
A typical 105-key computer keyboard, consisting of sections with different types of keys. A computer keyboard consists of alphanumeric or character keys for typing, modifier keys for altering the functions of other keys, [1] navigation keys for moving the text cursor on the screen, function keys and system command keys—such as Esc and Break—for special actions, and often a numeric keypad ...
Thus, e. g. the Yen symbol “¥” occupies the shifted position on the 6th letter key of the second row, whether this is the Y key on a QWERTY keyboard (like the US layout) or the Z key on a QWERTZ keyboard (like the German layout). ISO/IEC 9995-3:2010 applied to the US keyboard layout
2 29.13524 1 21 a͵͵ a 0: 1 27.50000: 97 20 g ♯ ͵͵/a ♭ ͵͵ g ♯ 0 /a ♭ 0: 0 25.95654 low g# (10 string) 96 19 g͵͵ g 0-1 24.49971 95 18 f ♯ ͵͵/g ♭ ͵͵ f ♯ 0 /g ♭ 0-2 23.12465 94 17 f͵͵ f 0-3 21.82676 93 16 e͵͵ e 0-4 20.60172 92 15 d ♯ ͵͵/e ♭ ͵͵ d ♯ 0 /e ♭ 0-5 19.44544 91 14 d͵͵ d 0-6 18.35405 90 13 c ...
[2]: 7-10 The isomorphic keyboard shown in this article's videos is the Wicki-Hayden keyboard, for that reason. It also has symmetries related to Diatonic Set Theory, as shown in Video 3 (Same shape). Video 3: Same shape in every octave, key, and tuning. The Wicki-Hayden keyboard embodies a tonnetz, as shown in video
Figure 2: Kaspar Wicki's isomorphic keyboard, invented in 1896. On an isomorphic keyboard, any given musical interval has the same shape wherever it appears, except at the edges. Here's an example. On the keyboard shown in figure 2, from any given note, the note that's a perfect fifth higher is always upward-and-rightward adjacent to the given ...
Pseudo-octave (2.1:1) A pseudo-octave, pseudooctave, [1] or paradoxical octave [2] in music is an interval whose frequency ratio is not exactly 2:1 = octave : tonic expected for perfectly harmonic pitches, but slightly wider or narrower in pitch – for example 1.98:1, 2.01:1, or even as large as 2.3:1 . [1]