I must agree that I’ve noticed the victory jingle in A14, it sounded like once per footman (my 3 footmen were attacking the same enemy, and when they ended, the jingle sounded like with echo, repeated with a certain delay). I came with this hipothesis because I noticed the change when I had 1, then 2, then the 3 footmen.
Don’t know who to page for this… Maybe @yshan knows.