In Fact, I just compiled 2 ways of doing the phons curves, by Robinson-Dadson, and the ISO226:2003.
glad to see it's released and GPL'ed, but can you just add « with lots of help from Mathieu Bouchard » somewhere in the comments ?
_ _ __ ___ _____ ________ _____________ _____________________ ... | Mathieu Bouchard, Montréal, Québec. téléphone: +1.514.383.3801