I am a bit torn between getting the Fobes Cocobolo barrel or the Fobes African Blackwood. The kind of tone I want is like Martin Frost's (I know I will never sound like him, but I want to be close). I want a tone that can go from dark to bright and while being warm and light on the notes. I have an R13 and an M30 mouthpiece with the Rico Classic. Also, has anyone tried the Hard Rubber Line?