Pickleball, said to be the fastest-growing sport in America, has a signature sound: the hollow pop of a hard paddle striking a plastic, Wiffle-like ball. You can’t miss it as you approach a game in progress. You’ll also hear the squeak of sneakers, whoops of delight and amazement, laughter, the occasional groan of defeat, and a light clack as players head to center court at the end of a game to tap each other’s paddles and say, “Thank you.” Christy Howden and Leslie White, co-owners of Wolverine Pickleball, never tire of this soundscape. To them, it signals pure joy and is a siren call to come and play.