... , Hi-lo, Wail, engineering, high-frequency impulse,Yelp-s. 2.Manual: Horn*3.8sec. Yelp-s, COCO, siren. 3.Mix: yelp + Wail, Wail ... +Wail, Hi-lo+ Yelp-s, Yelp-s + Wail, engineering + Yelp-s, high ... -frequency impulse + Wail, Yelp-s + Wail. 4.Lighting: three routes5. ...