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Octave pedals. analog - uses a simple divider circuit, so produces a synth sound unrelated to the timbre of the input. (although some have an output which tracks the input in volume) These have a very fast response. They don't do chords. May have very irregular tracking. digital - complex process, so you always get a delay. Signal output attempts to sound like the input slowed down. Will work with chords, but will be optimised for either single notes or chords. Always tracks, but signal may be broken up. andy butler