I've been trying to find some information on oratory practices in ancient times. Strangely, I am not finding much. What technique(s) were used?
It's hard to imagine the Buddha raising his voice to address large crowds, but maybe I'm just projecting. Maybe he could really holler. Did they rely on echo, repeating at intervals, hand gestures, a loud person, etc.?
At one time the Blessed One was living near the city of Gayā, on Gayāsīse, together with a thousand monks. There the Blessed One asked the monks: