You input gates and based on the probability and the weight knob it’ll send one of 2 values or do nothing. Think about our or like this; you have your filter where you want it but once in a while you want it in one of two other places. Random Tweek Duo is your man. Gate outputs Yes; sends when a tweek happens or No; sends when a tweek does not happen.

Updated cause it didn’t like polyphonic gates. Now it gets along.
Updated again cause I f$&!ed it up