Excellent description and demonstration!
p.s. Don't worry about your accent. You are completely understandable. If you want to be able to control your voice and pronunciation, find a music teacher (or a voice acting coach) and take a few months of lessons. You will quickly learn how to listen to yourself and modify your pronunciation on the fly. I found that learning how to sing songs in other languages than my native American English made me better at speaking English! Another trick is to use a fake British accent, and most Americans will think you're very intelligent!