What I meant was that you are seeing the readings possibly in millivolts, not actual counts of identified knock. On my Edge, IIRC, I have seen the counts in ForScan rise with RPM, for example, I will check again the next time I get a chance to log. Let's say the threshold is 1 V or 1000 mV. Anything over 1000 would then be a knock event and dealt with accordingly by, for example, retarding timing. The threshold is not static, as engine behavior changes with RPM & load.