How to pronounce “whirring”(noun) in English

So he's recorded the sound of insects in ponds and when you listen to it, at first -- at first you hear really a lot of -- a lot of sort ofunconnected, disparate kind of noises or sounds. A lot of clicking and a lot of buzzing this sort of thing, whirring, things that sound like static.And after time as it builds up and it's probably the way he's put the recording together , but as it builds up , you start to hear this very,