Stingray Digital Group Inc. has bought Numedia, a company that provides technology used by retail stores to play in-store audio. The company said in a press release Wednesday that the deal is worth $2 million. According to Numedia’s website, its “technology allows its clients to manage and operate digital displays or in-store music through its proprietary software.” The release said the acquisition would create “operational synergies” with its Stingray Business commercial services division, which operates in 74,000 Canadian locations, including TD Canada Trust...