Hmm, hearing second crack... Not to go on, or anything, but I did a roast yesterday afternoon in which I was able to stop it after the very first snap of the second. Heat gun and a bowl and you hear EVERYTHING!
With this roast I'm talking about (Kenya Gethumbwini), I've found that it does great if you slow it down after first and try to catch it right before second. Okay, I just barely missed that



