A repeated phrase illustrates the different tonal colours implemented by the dolce and una corda (U.C.) ‘timbre pedals’.
1st : – no timbre pedals are engaged , only the damper pedal;
2nd : – dolce pedal creates a more contained overall sound and in this application a brighter tone;
3rd : – U.C. & dolce p – a dramatic change in timbre, a rounder tone with less high frequencies,
4th : – U.C. & dolce f- played at fortissimo.

On the fourth repeat, played at fortissimo with the dolce and una corda fully engaged, a significant sustain occurs in the sound of the paused treble melody notes, ‘a’ and ‘d’.

7. Spectrum swell with damper pedal :

The harmonic spectrum of a sustaining note is controlled by engaging the damper pedal The prepared selective sustain of the lowest and lower notes are harmonically in sympathy with the affected higher note.