Hello Hiroshi Obiki, welcome on our new community!
Thanks a lot that you followed the invitation by your friend Koichi Makigami. If you have any questions how you can use all capabilities of this network please check out the FAQ, videos and blogs on my impressum page.
If you are well acquainted in theory and / or practice in vocal technique, harmonics and overtones, I would greatly appreciate if you put in a little time to answer the questions in this link below. Best wishes Dag Arvid Thelle…See More