FYI, the "knock signal" field as reported by the ECU is close to useless. The only time it will report actual knock is if it happens exactly at the same time as the software is recording the data sample. Considering the relatively slow sample rate of the software and relatively high frequency of knock, it is not likely that the two will coincide. The only way to tell if there is knock from logs is by looking at the knock correction field and referencing it to the actual dynamic advance table. The problem with that is that you have to have access to your actual map, so only the tuner can actually know for sure.