Electro Harmonix Small Clone chorus (top middle)

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Analog chorus pedal, "popularized by Kurt Cobain."
[product page] Can be seen in a group of effects in a video of Billy playing A Song For A Son on a Rhodes piano, posted on Kerry Brown's blog on 2009/10/12, along with a Vox phaser, Maestro PS-1 phase shifter, etc., although it does not appear to be plugged into anything.