An expansion of the Perinton Community Center was planned to include a large indoor water park and pool. This large building, located at the top of a hill, faces an existing amphitheater that offers music during summer months. The owner was concerned that they not bounce sound off the building into adjacent residential areas, and wanted to prevent echoes back to audience at the amphitheater. Interior acoustics of the water park and pool were additional design concerns. AVL was contracted to provided analysis and recommendations for the building inside and out. Our first recommendation was a shift to the exterior walls and their orientation to eliminate some specific reflections. In design, we also employed a specialty masonry product on large areas adjacent to large vertical glazings. This product (RPG Diffusor Block) effectively breaks up sounds waves instead of reflecting them. This masonry dealt with direct sound hitting the block as well as bounce off the glazing. No neighborhood problems or audience problems occurred after the structure was finished and the summer concert season ran without incident. We had been brought into the project later in the design process so roof decks within the spaces were solid not acoustical. Interior acoustics were controlled with absorbent lapendary baffles applied up at the roof deck, making the solution relatively invisible to patrons. The interior acoustics are appropriate for a natatorium and the community is making wide spread use of the facility.