I have a baritone Lanikai LU-21B with Aquila strings. I am also having difficulty getting clean notes and chords with finger picking and chord/melody pieces. There is an ugly buzz, something like an angry bee on note and chord changes. It seems to come with the string vibrating against the skin of a finger or fingers when a note or chord is struck or released. It can be minimized if I carefully time the pluck with the placement of the finger or fingers, but I do not seem to be able to eliminate it entirely. Andrew’s playing has beautifully clean notes. I do not hear any buzz when he plays. What needs to be done?