Same as Dancook. I have slave Sound Effects Only and use my ears. If it's white trash (lols) I can hear because it's typically only 2 keypresses worth of abilities. If it's elites, I do a scan after those packs in habit. Breakables/chests, I can always hear. At the end of a map, TAB minimap and swap through sessions.

Of all the Legs I've been aware of, I've never missed any...