The ED-1 "Edward" Compressor is another great guitar effect pedals released by Marshall. Like the other models in the series, the ED-1 is issued in a sleek, metal housing that looks as good as it sounds."Add sustain to your solos, even out your attack and get rid of those nasty peaks and troughs. For smooth legato lead, funky clean chords or choppy chicken pickin' call on The Compressor."
ED-1 Compressor page at Marshall 's website...