Hi Peter,

At the website Mark gave above it explains that many of the older rolls were not even played by someone. They were marked up by hand and cut. Which also accounted for the expressionness sound in addition to the fact that the early rolls did not record that information as Alec said.

It was up to the person pumping the pedals to provide that aspect of the sound. What a tough job that would be to keep up the tempo and still pump hard or soft on the pedals.

Heather