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Q: EDP & CV pedal for feedback control

I'd tried to modify a standard passive volume pedal to function as a CV 
pedal for my echoplex but ran into a strange problem. 
When set to zero feedback (one repetition) the loop ends with a "pop" - 
this doesn't happen if I start with a higher feedback level & then move 
the pedal to zero - only when the pedal is at zero when the loop is 

The pot is 100K - i'm not sure about the taper, but judging from how it 
behaves with the echoplex it may be logarhythmic. Should I be using a 
linear pot instead?