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Knock audio analysing software

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Hello

What do you guys use/advise to analyse or filter you're recorded knock detection audio files?

Would like to watch the waveforms and if podsible filter, to distinguish what is actual knock and what isn't.

I use PC LINK (LINK ECU) Software. It has an knock audio modul with FFT analysis. You can use it without a Link ECU. Just plug in microphone plug into your laptop.

Didn't knew you could use this function without a link ecu. It's actually a link g4*+ knockblock that i'm using ;)

I've used Gold Wave in the past with good success. This was actually the software that Link recommended for frequency analysis before the G4+ was introduced.