According to this website, the bugle call "Taps" was not written by Butterfield but existed as the end of the bugle call "tattoo" and appears in several prewar manuals.

Tattoo was the signal to prepare for bed. Later, the call "extinguish lights" was played on the bugle and "Following the call, three single drum strokes were beat at four-count intervals. This was known as the “Drum Taps” or in common usage of soldiers “The Taps” or “Taps.”

I would assume (and you know what happens when you assume) that the taps referred to in the Crystal Hill regs is the drum taps.

Link to 5 page history of taps written by an army bugler(where the above came from) below.