ELECTRO-HARMONIX

electronic equipment for use in connection with the reproduction of audio signals; namely, phase shifters, echo units, channel selector switches, flangers, distortion units, frequency equalizers, guitar sustainers, preamplifiers, amplifiers, wah-wah pedals, octave synthesizers, noise eliminators, envelope followers, mixers, bass boosters, foot pedals, treble boosters, attack controls, attack equalizers and cables, digital delays, samplers