The siren sound they used for his Ramcharger was actually just the sound of a whelen strobe power pack discharging and recharging over and over. So, in that case, you really could hear the strobes!
It was an own created wail + a strobe. But I do agree I'd like to see it in the game! Kind of hard though to remake a siren like that. Never the less I begg someone to try 🙂