E-Mu PROTEUS FX Manual do Utilizador descarregar pdf (Página 55)

4 - Preset Editor

Preset Globals

E-MU Systems 55

The Just C Tuning Tables

Well Tempered and Just were standard keyboard tunings up until the 20th-century

when the current “equal tempered” scale became prevalent. In an equal tempered

scale, the octave is equally divided into 12 parts. In Just or Well Tempered scales, the 12

notes are separately tuned to produce pure chords. However, in Just tunings you are

limited to playing certain chords and if you play the wrong chord it may sound

terrible!

Tuning tables can be changed as you play using a program change (create several

presets with the same sound and different tuning tables) or using a continuous

controller (link 2 presets and crossfade between them using a controller).

The Just C2, Just C min, Just C3 Tuning Tables

Fully explaining the mysteries of just intonation is beyond the scope of this manual,

but the subject is covered exhaustively in Hermann Helmholtz’s On the Sensations of

Tone, available at most libraries and bookstores.

The four just intonation tables are called Just C2, Just C3, and Just C Minor. Try playing

in the key of C/Cm using each table. You’ll quickly discover both the wonders and the

frustrations of just intonation! In Just C, for example, you’ll find that the chords C, Em,

F, G, and Am sound beautiful. If you hold one of these chords, you’ll hear no

“beating”. After playing for a few minutes, switch back to Equal Temperament for a

rude awakening!

At this point you might wonder why anyone would use Equal Temperament to begin

with. For the answer to that question, play a D, Dmi, or Bb chord! The intervallic ratios

that make the C & G chords sound so pure make the D chord sound horribly out of

tune. That's why we had to include Just C3. In this tuning, D, Dmi and Bb sound in

tune, but the G chord will sound wrong.

Each of the 4 tables allows you to play a different group of common chords in just

intonation. Sadly, there is no single 12 note tuning that will allow all of the common

chords to be in tune, and of course that's why they invented the equal temperament

tuning system that we use today.

Just C

Play these chords: C, E, F, G, A, Cm, C#m, Em, F#m,

Gm, Am

Just C2

Play these chords:

C, E, F, G, A, B, C#m, D#m, Em, G#m,

Am, Bm

Just C minor

Play these chords: C, D

, D, E

, G, A

, Cm, Em, Fm, Gm

Just C3

Play these chords: C, D, F, B

, C#m, Dm, Em, F#m, G#m, Am

1 2 ... 50 51 52 53 54 55 56 57 58 59 60 ... 133 134

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