the yesterday effects polychorus is a copy of the original, non-reissued echoflanger circuit (the one you've heard on your favorite records). four modes and four knobs rule over the sound of polychorus. modes: filter matrix, flange, chorus, and double track. knobs: feedback, rate, width, and tune. in addition to these front mounted, external controls there is an internal level trimpot which can be used to adjust the pedal's overall volume. the yesterday effects polychorus uses mn3007, a more readily available bbd chip capable of the same performance as the original sad1024 bbd chips.

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