Home / Forums / Melodica technique / Sonny Boy Williamson Apparently Covering the Outlet Slots on His Harmonica / Reply To: Sonny Boy Williamson Apparently Covering the Outlet Slots on His Harmonica Reply To: Sonny Boy Williamson Apparently Covering the Outlet Slots on His Harmonica February 5, 2017 at 3:29 pm #8190 LowboyParticipant Nice playing Jazzman1945. Lowboy