In the case of modulation effects, a change occurs not in the volume but in the pitch of the sound. This results in effects with "floating" sounds know as chorus and pitch shifter. If the modulation also changes rhythmically, a different array of effects emerge: Vibrato, Tremolo, Flanger, Phaser and the Leslie sound. Who invented all this? No, not zee Swiss, but Leo Fender who had added a tremolo arm to his guitars which allowed the player to adjust the string tension, which in turn affects the pitch of sound. This results in the vibrato effect - but please, hush, good ol' Leo has not noticed ever since.
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