Yeah, Reg isn't too off the mark. I'm a proponent of loud, for adjacent motorists to know you're there, but not for obnoxious idiots to be cracking throttle near patios, or low speed roads, or to just garner reactions. And candidly, my bike isn't loud
enough..
I do recall tho, at Too Cool Motorcycle School, Trevor instructing a double blip, when clutch in, and decelerating to a light.