The act of adjusting an organ pipe (or wind instrument) so that it conforms to the standards of tone and pitch and color WordNet 3.0 & Open English WordNet

In music theory, voicing refers to two closely related concepts: How a musician or group distributes, or spaces, notes and chords on one or more instruments The simultaneous vertical placement of notes in relation to each other; this relates to the concepts of spacing and doublingIt includes the instrumentation and vertical spacing and ordering of the musical notes in a chord: which notes are on the top or in the middle, which ones are doubled, which octave each is in, and which instruments or voices perform each note. Wikipedia

The distribution of a chord's notes, either in composition or orchestration Wikipedia Disambiguation

A particular arrangement of notes to form a chord. Wiktionary

Music: particular arrangement of notes to form a chord. Wiktionary (translation)