Yamaha PSR-S950 Reference Manual - Page 11
Pitch-Related Settings, Fine-tuning the Pitch of the Entire Instrument, Scale Tuning - psr series
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Pitch-Related Settings Fine-tuning the Pitch of the Entire Instrument You can fine-tune the pitch of the entire instrument such as keyboard, Style and Song parts (except the keyboard part played by the Drum Kit or SFX Kit Voices, and audio playback)-a useful feature when playing the PSR-S950/S750 along with other instruments or CD music. 1 Call up the operation display. [FUNCTION] [A] MASTER TUNE/SCALE TUNE TAB [E][F] MASTER TUNE 2 Use the [4 ]/[5 ] buttons to set the tuning in 0.2 Hz steps. 1 Press both [] and [] buttons (of 4 and 5) simultaneously to reset the value to the factory setting of 440.0 Hz. Voices Scale Tuning You can select various scales for playing in custom tunings for specific historical periods or music genres. 1 Call up the operation display. [FUNCTION] [A] MASTER TUNE/SCALE TUNE TAB [E][F] SCALE TUNE 2 Use the [A]/[B] buttons to select the desired scale. The tuning of each note for the currently selected scale is shown. Preset Scale types EQUAL PURE MAJOR, PURE MINOR PYTHAGOREAN MEAN-TONE WERCKMEISTER, KIRNBERGER ARABIC1, ARABIC2 The pitch range of each octave is divided equally into twelve parts, with each halfstep evenly spaced in pitch. This is the most commonly used tuning in music today. These tunings preserve the pure mathematical intervals of each scale, especially for triad chords (root, third, fifth). You can hear this best in actual vocal harmonies- such as choirs and a cappella singing. This scale was devised by the famous Greek philosopher and is created from a series of perfect fifths, which are collapsed into a single octave. The 3rd in this tuning are slightly unstable, but the 4th and 5th are beautiful and suitable for some leads. This scale was created as an improvement on the Pythagorean scale, by making the major third interval more "in tune." It was especially popular from the 16th century to the 18th century. Handel, among others, used this scale. This composite scale combines the Werckmeister and Kirnberger systems, which were themselves improvements on the mean-tone and Pythagorean scales. The main feature of this scale is that each key has its own unique character. The scale was used extensively during the time of Bach and Beethoven, and even now it is often used when performing period music on the harpsichord. Use these tunings when playing Arabic music. PSR-S950/S750 Reference Manual 11