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On Thursday, August 07, 2008 12:57 PM, Trey Bunn wrote: > The tricky part was determining exactly how much to pitch > shift the imported sound to make it sound like 78rpm again > (up 15 semitones, in case anyone else is curious). 14.78 semitones (33.33 to 78.26 RPM) 14.72 semitones (33.33 to 78.00 RPM) The human ear can detect pitch differences as small as 8 cents (or 0.08 semitones), so precision does matter. Since I make this calculation regularly, I've created a simple Excel spreadsheet for computing pitch shifts. Feel free to email me privately if you'd like a copy of the spreadsheet. Eric Jacobs The Audio Archive, Inc. Tel: 408.221.2128 Fax: 408.549.9867 mailto:[log in to unmask]