"Just intonation" is an ideal tuning of pitches, improving natural sounding of the chords. It is often used intuitively in polyphonic songs, giving a specific color very pleasing to the ear. Classified as utopia centuries ago, equal temperament has been preferred by western music, dividing the octave into 12 equal semitones. This compromise allows the construction of contemporary western music as we know it today, and the playability of the keyboard instruments (piano, ..) in all tones and modulations.

Using the Expresseur, the just intonation in instrumental accompaniment is very easy. The software tunes the pitches in real time. Chords are all naturally tuned, whatever the complexity of modulations. The musical indications to add in the score are very simple: the root of the chord, and, if necessary, the unchanged pitch between chords (pedal ..). The software performs all necessary calculations and realization during the live performance !

Thanks to the Expresseur, it becomes easy to accompany singers, guiding and supporting them precisely in just intonation (which is impossible with a conventional keyboard instrument using a static tuning). The ability to have multiple audio output can even support each voice separately (Bass, Soprano, ...)

The use of just intonation can be considered obsolete. Several centuries of equal temperament suppressed more or less the ability to hear the added value of just intonation in polyphony. Contemporary sound modulations (vibrato, pitch-bend...) reduce or override the subtlety of just intonation. But, perhaps, the just intonation, finally available for instrumental accompaniment, can trigger new ideas , not only by revisiting classical scores (Roland de Lasus, ...), but also creating new styles (contemporary polyphony sung with "instrumental" accompaniment ).

Using just intonation with the Expresseur :

Other use :