I use a Coretto and can hear the sounds quite well (even thought I am a little deaf) and I studied numerous articles on roasting on this and other sites. But the best indicator I have found is the colour of the beans. I bought a few beans from brown bay and I quickly worked out what colour roast I liked (Medium to dark) then I started roast to that colour. I have yet to be disappointed. On one occasion I roasted a bean to a recommended level and found it not to my liking.
Basically trial and error are the best teachers. The roasting profiles are a great help but in the end a few stuff ups teach you more. Then again what I thought was a stuff up in one bean turned out to be a great roast 5 days down the track. Welcome to a life of learning and sometimes frustration, but it is worth it for the quality of the coffee.


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