octave effect
octave effect is an audio effects unit.
Also recorded as octave pedal; octave device; octaver; octave divider; octave multiplier.
In detail
Its recorded use is pitch shift.
Sources
Each source is named with the standing the house places on it, so the evidence can be weighed rather than taken on trust.
reference work · Reputable secondary · Wikipedia
“Octave effect”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q931470: octave effect
Consult the source