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Noise from powered expression controller


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HD500, with a Source Audio Hot Hand 3 controller.  I've been using this setup for at least a year now, but I only just noticed a bit of crackle when playing through headphones.  I unplugged the patch cord from the HH3, but left it powered on, and the sound disappeared.  Also unplugged power from the HH3, and left it plugged into exp2.  No noise.  All power cords are far removed from each other, and I did use new patch cords, instrument cables for the exp2 connection.  No other variables got rid of the crackle besides powering down and/or removing the HH3.  Is anyone else experience noise when using a powered expression pedal?  

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