The non-harmonic tones in the low notes F₀ and C₀ , suggest atmospheric and abstract compositional settings. The partial tones (harmonics) within the sound of the sustained ‘F₀’ note are audibly very clear and stable. F₀ is the lowest note of the 97 key Stuart pianos, and C₀ is the lowest note of the 102 key Stuart pianos.

12. F1 octave damper pedal release, timbre change:

The slow release of the damper pedal, while the sostenuto pedal selectively sustains the lowest F triad including the lowest C0, creates a harmonic change in timbre of the F1 & F2 octave.

13. Low register chord clarity:

The note E1 in the low register is played in a low dissonant chord, balanced against F2 above. Selectively sympathetic lowest register resonance of F major and a mid treble E triad sound is sustained subtly in pianissimo. The dissonance of the low ‘E’ is stable and clearly sustained.