Restaurants can get noisy, even when they're not very crowded. Their hard surfaces create reverb and amplify sound. Customers often have to shout over the sound of piped-in music, kitchen activities, and other customers.  These noise levels could be reduced with sound panels and other noise treatments. We discuss some options with Mitch Zlotnik, founder of Audimute, one of the leading companies in the United States that makes custom noise-control products.