Voix céleste

Organ stop detuned for beat effect

The Voix celeste is an organ stop consisting of either one or two ranks of pipes slightly out of tune. The term celeste refers to a rank of pipes detuned slightly so as to produce a beating effect when combined with a normally tuned rank. It is also used to refer to a compound stop of two or more ranks in which all the ranks are detuned relative to each other.

This keyword could refer to multiple things. Here are some suggestions: