Hi all, We have many variables to deal with. The some of the areas of concern are: Size of instrument Quality of Instrument Age of instrument Philosophy of scale design tightness of tuning pins friction of rendering points hardness of hammers playing conditions lighting heating systems air conditioning humidity control barometric pressure (which affects the partial pressure of water vapour) previous work Many of the above are beyond our control. We have to work with real pianos in a real world situation. I would invite people to comment about the relative importance of these factors. Please feel free to add to the list. Regards, Don
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