The means by which the timbre, attack, loudness etc of the pipes or strings of keyboard instruments and some non-keyboard wind instruments are given their desired quality and uniformity. In the organ, voicing concerns the amount of wind issuing from a flue or the thickness and curvature of the reed tongue. In harpsichords and other quilled instruments, voicing involves adjusting the quill to arrive at an even touch and tone. The voicing of pianos involves altering the hardness of the subsurface felt of the hammers.