Hi Howard.
This sounds to me like a polarity issue.
I'm not familiar to the KN7k, about if there is any option in the menu settings to switch pedal polarity.
Many pedals have this option with switchable polarity as well. If this is not possible at KN or pedal, then a option is to swap wires to opposite position in the plug itself, or inside the pedal.
(And of course, there may be a solution to buy another pedal that have this option by a manual switch).