The 88-note standard scale was established at a convention in Buffalo, USA, in 1908. From 1910 onward, most manufacturers gradually built the 88-note scale. And this despite the fact that there are very few pieces of music that use all 88 keys of a piano – and that even after 1910, a great many upright and grand pianos had only 85 keys. During the transition period, most manufacturers offered systems with two roll scales (“double scale”).
Most 88-note pianolas already have the control information for automatic melody accentuation (Solodant, Melodant, Themodist, etc.) on the music rolls, and many also have automatic operation of the right sustain pedal. Holes or levers for tracking control can also be found. This means that further perforations are provided in addition to the 88 holes for the notes.