I have been recording mine (1UZ) with a notebook soundcard, and post processing the signal with adobe audition. This allow you (me) to isolate the characteristic knock signature. When compared to the datalogs from my autronic SM4, it is a useful tuning tool. I also have a Link knockblock to provide a 0-5V analog input to the ECU based on knock intensity, which I can use for closed loop timing or boost control.
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