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88-note roll

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A standard piano roll for player pianos conforming with a standard agreed at the Buffalo Convention on 10 December 1908, where most of the largest U.S. manufacturers of player pianos agreed on some standards. The group settled on a width of 11.25 inches (286 mm) and perforation standards for 65-note rolls of 6 holes to the inch, and for 88-note rolls of 9 holes to the inch. Thereafter, a customer could buy a conforming player piano from any maker and buy standard 88-note rolls from any music shop, instead of being restricted to the rolls issued by the maker of their specific instrument.

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