In similarity to coffee: Consider very small producers. The problem with coffe and chocolate is that the real taste only results from the last production steps (after fermentation and roasting). That means that companies that buy from many small farms (sometimes hundreds) have no clue which farm did it the best and thus the farmers also don’t know it.

But because only the farmers have a really strong influence on the quality of the chocolate they need to know if what they did was right.

Now a small company might have their own farms or work with very few suppliers they can give feedback about the quality. The farmers can produce better raw chocolate beans and the chocolate tastes best.

Also because the farmers learn their worth we westeners can’t exploit them so nicely and we avoid slavery.

It’s the Sound they make and a phenomenon called Sand liquification . Basically it means that Vibrations and Air turn Sand in a liquid like state.