Harding was a technology buff. In 1923, the same year he died in office, Harding recorded a speech on a phonograph that could record and play back sound on wax discs. He was also the first president to have a radio installed in the White House.
Taft did something similar as well. The website gives the comparison that Jackson’s inaugural address was given to 10,000 people, of which only a few could hear him whereas 125,000 heard Harding’s address.