Our second and third cornet players have adopted the plastic mouthpiece to play on. Better not comment on the sound. What mouthpiece would you recommend for fourth section 2nd & 3rd cornet players to give them more chance to play in tune - apart from the obvious of practice makes perfect. I would have thought a large cup would help in lower range - being a baritone player I prefer a deeper cup in any case. Any suggestions out there - and please dont be rude.