I vaguely recall reading about someone who has an iPhone app that helps detect first and second cracks. (I couldn't find the reference, however, if there was one.) I am not hard of hearing, but my roaster does 32 dry ounces/batch, so it is quite loud with all the beans knocking around.

Most coffees are easy to hear the first crack. However, the second crack, especially when it just starts, before the crescendo, is sometimes, with some coffees pretty hard to hear. I would like to pull some coffees at the first hint of 2d crack, but sometimes I'm 20 seconds late (I guess).

I was thinking of getting an iPhone app developed that would cancel or filter out the background noise of the beans and show the cracks graphically, like a seismograph.

Has anyone done something like this? Is it a good idea? People who are roasting smaller batches probably don't have the problem as much. People who are hard of hearing probably do.

dan

I read about an app called "Spectrogram" for the Iphone that's an audio spectrum analyzer that allows you to see the cracks on a mailing list.

I didn't try it since I have a droid, but I did download some free apps that may work, but the Behmor's not that loud.