Hi JD Very nifty indeed. I noticed you included the ability to alter design concert pitch frequency. Thats one of the first elements I included in the sheet I am working up now. Good idea me thinks. This gives me a few ideas for getting rid of columns :) As for Log scale entry. Clearly see the benefit spreadsheet wise. But what if you have to make some kind of a bend in the curve somewhere to accommodate some physical situation in the piano ? How is that handled ? Cheers RicB ---------- I attach a roughly composed alternative to your spreadsheet to show what I mean. You will see how it works by editing the named cells (for example, set n1_ to -5 and a49_ to 442) and looking at the formulae. JD
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