When those Swedish Lutherans wanted to purchase a pipe organ in 1909, Rev. Bergren somehow was able to have half of the $4,600 for the cost of the organ paid for by the Andrew Carnegie, steel magnate in Pittsburgh.

After the organ was installed, a pump organ, it was discovered that the organist was not quite tall enough and so not strong enough to push the pump pedals. So those creative problem-solving Swedes drilled two holes in the floor underneath the two pump pedals, attached two ropes, one to each pedal, and had two men in the basement pull on the ropes to pull the pump pedals for the organist.
-- "The History Of The Lutheran Bethlehem Church," The Post-Journal, Oct 19, 2016.

This makes it unclear whether the Barnes & Buhl was 1909 or 1915 was some additional work on the organ.