I just recently purchased a trumpet. However the last instrument that I played was a french horn. Of course that was in high school.1994 I started out playing the trumpet and switched. For some reason I am playing higher notes. Im unable to hit any low ones. I know that the mouth piece on the french horn was extremely small. Is there any way I can bounce back from this. I still know all of my notes and scales but im having a time with my embouchure.