Goldpoint for Crack

I installed the goldpoint attenuator a week ago and I think it sounds fantastic. However, I am getting some popping sounds when I raise it up or down. I read that this is fairly common in stepped attenuators, but is there a way to get rid of this noise? Arn from Goldpoint said to try adding coupling caps, what kind do I need, and how do I install it?
 
A Valab or a Khozmo attenuator won't pop.  Goldpoint attenuators have been used for decades in our Foreplay preamp without popping (which has the same first gain stage tied to the attenuator that the Crack does).  Perhaps just try a Valab instead?
 
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