Hi All The things I'm looking to do is increase my range, stamina and power. My range is generally fine but I struggle to pitch a top D (above top C) comfortabley. Is there anything I can do to get it (i) more secure and possibly (ii) go higher? My sound is good, I have a fine tone but my sound becomes hard when I increase my volume. I need the sound to become bigger not louder. Can anyone give me some helpful advice? I'm hoping for techniques, reading material etc. Thanks in advance. I hope my English is ok.