9 yo DS has developed an incredibly annoying way of speaking lately- a sort of cross between a mumble and whine which is barely intelligible. We have talked to him about it and pointed out that he gets upset that people aren't listening to him as they can't understand what he is saying, and he needs to speak more clearly, but to no effect.
He actually attends drama/singing classes and they had their show today and the teacher was talking about clarity and projection which the other kids seem to have taken on board but his lines were quiet and mumbled.
Any ideas on what we can do to help him? Google seems to direct me to mumbling in younger children.