A graveside service for Wallace Smith, general manager of WPPB, WLIU, and WPBX radio in Southampton for 25 years and a familiar voice on the FM airwaves, will be on Sunday at 2 p.m. at the Shelter Island Cemetery, which is at 32 North Ferry Road, behind the Presbyterian Church. WPPB became WLIW in 2020. Mr. Smith died on Oct. 27.