Can anyone help I currently work in compliance and we listen to call recording with conversations between broker and customer and most of them are edited but I can’t get know solid evidence which will stick , do any of you guys know any tricks I can use or to look out for when an running the call through audacity to identify if the call is edited.
Sorry Rocks, I’m happy to help you to use Audacity, but I’m really not into this cloak and dagger stuff. If this is a professional matter, you need to get help from a suitably qualified professional. If it’s more of a personal matter, then you might be better just to ask the person in question.
A flat line in a recording just shows that the recording level is very quiet or completely silent. Selecting the region of “flat line” and applying the Amplify effect will reveal whether the section was “low level” or “absolute silence”. “Absolute silence” cannot be amplified (the Amplify effect will show the “New peak level” as “-infinity”).
“Absolute silence” could indicate an edit, or could be a “drop out” in the recording (the recording has dropped some of the data), or corruption in the recorded file, or (in an Audacity project) a missing or corrupt data fragment, or (for a voip recording) network congestion.
“Very low audio” could indicate that no-one is talking, or (for a 'phone call recording) the recording end has been put on hold, or the caller has muted their 'phone, or (for a mobile phone) reception has been lost, or (for a voip recording) network congestion.
There are probably other possibilities - those are just some off the top of my head. As I have repeatedly said, if this is a professional matter, you need professional advice from a suitably qualified professional.
The blue waves will only show you about the loudest 30dB or so of the show. Any quieter than that you have to go to the sound meters which will bounce with sound down to the limit (about -90dB). That Effect > Amplify thing is the other way to show quiet stuff.
It’s going to be impossible to separate equipment and user screwing up from someone actively trying to create theater instead of real life. As he said, If Steve cut this work, you would not be able to tell what he did.