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So the sound is completely artificial, constructed by you?

( It is very convincing. )

Based on real recordings, but with a lot of processing.

Our two cats seemed to think it was worth investigating when I played it for them - presumably thinking that my iPhone was a very odd looking cat!

How did you get your two cats to peacefully purr in front of a high-quality microphone?!

It was not about getting the cats close to my microphones, but getting the microphone close to the cats :D