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 January 15, 2017 at 5:37 pm #8135 LowboyParticipant And I should add, if it was not clear in my original post, that in the posted video, you can see Sonny Boy Williamson use his fingers to block certain areas of the outlet of the harmonica. Lowboy