This is what it sounds like when my roasting coffee beans reach the 2nd crack. It's quite loud, even over the noise of the rotisserie motor. Saturday's roast was French roast beans from my steadfast source, Sweet Maria's.
I've been a home roaster for 9 years, mostly because I can get a good quality bean at less than 1/2 the price. Total time, from heating up the grill to removing the chaff is about an hour, but only about 10 minutes is active time. Ever a fan of multitasking, I usually take this time in the backyard to rake up coastal redwood needles and pick up dog poo, two chores that are neverending.