What Are Tremolo Guitar Effects Pedals & How Do They Work? – My New Microphone
Jackson Audio New Wave Analog Chorus Vibrato Guitar Pedal — Chuck Levin's Washington Music Center
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Vibrato unit - Wikipedia
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Guitar Pedal X - GPX Blog - Alexander Pedals' Marshmallow Pitch-Shifter and Sugarcube Stereo Chorus/Vibrato/Rotary make for a Formidable Pair of Tone Sweeteners