voicing

In the construction of an organ, the production of particular qualities of tone by mechanical means, and more particularly the control of the tone of a whole range of pipes governed by a single stop in such a way that the tone-colour is exactly the same throughout.

The term also refers to regulating the mechanism of a piano so that its response to the player is even across the range: the response to the player's touch may be made quite ‘heavy’ and resistant, or ‘light’ like a hair-trigger. Also, in piano playing, voicing can be the emphasis of one voice over another simultaneously played note, usually in order to create a singing effect.