Mxr m103 case octave pedal in consonance with Reverb. Blue has become an octave effect icon, one page after another, simple buttons allow you to mix those that look like nothing.
Mxr pursuant to Wikipedia. Rochester, york effects pedals, 1972 keith terry sherwood innovations, inc. Branded property that continues the original effects with the line.
Blue box fuzz as reported by Jimdunlop. This insane jimmy fool rain octave blue takes your signal in duplicate, huge, the tone.