[URL='https://www.youtube.com/watch?v=Yri2JNhyG4k']This video[/URL] said:From 1903 to 1913, Claude Debussy recorded several of his own pieces on piano rolls. Debussy was delighted with the reproduction quality, saying in a letter to Edwin Welte: “It is impossible to attain a greater perfection of reproduction than that of the Welte apparatus. I am happy to assure you in these lines of my astonishment and admiration of what I heard. I am, Dear Sir, Yours Faithfully, Claude Debussy.” More than one century old, these recordings allow us to listen to the great composer playing his own works.
Rolls for the reproducing piano were generally made from the recorded performances of famous musicians. Typically, a pianist would sit at a specially designed recording piano, and the pitch and duration of any notes played would be either marked or perforated on a blank roll, together with the duration of the sustaining and soft pedal. Reproducing pianos can also re-create the dynamics of a pianist's performance by means of specially encoded control perforations placed towards the edges of a music roll, but this coding was never recorded automatically. Different companies had different ways of notating dynamics, some technically advanced (though not necessarily more effective), some secret, and some dependent entirely on a recording producer's handwritten notes, but in all cases these dynamic hieroglyphics had to be skillfully converted into the specialized perforated codes needed by the different types of instrument.