I don't remember where I saw it, but it was posted somewhere on these boards.
I recorded the sound on some Author interviews a while back and I must say you cannot pay me enough money to do that again.
Every single one of them had the worst mouth noise I had ever heard.
A 7 minute interview took me 5 days to edit (10 hour days).
I'm a stickler for no mouth noise and clean recordings. And authors were by far the worst I had ever heard in terms of mouth noise. I guess because they all drink coffee and eat ramen.
There are two main contributors:One of these days I am going to discover the cause of it and I'll be famous. It's a vitamin deficiency I think.