As a new student, I have a question about tone. Is it the mouthpiece, or is it the horn that is the determining factor on tone? I have a YTR-2335S with a Bach 3C. The lower register can sound full and round, but starting at middle C and up the tone will get on the edgy side of bright. Perhaps it is just me. I read on another forum that tone quality was 90% mp and 10% horn. Is this true?