What is a Harmonizer?
A harmonizer automatically generates a pitch at the interval you specify. Many harmonizers allow you to specify intervals such as an octave (higher and lower), as well as the third, fourth, fifth, and sixth. Some harmonizers also have options to select the key and modality, and the pedal will automatically generate intervals in that key.
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THE ELECTRIC FLUTE:
A BEGINNER'S GUIDE TO PLAYING FLUTE WITH EFFECTS