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 7, 2017 at 9:34 pm #8211 Melodica-MeParticipant Awesome technique Quetscher. I really like your Clavietta Labourdette a lot. Melodica-Me