With this virtual D-willow flute player, you can explore the notes of a D overtone flute and even compose your own piece for it. The white keys represent the open end of the flute, while the dark keys represent the closed end. For a better view on mobile devices, you can press the 0.5x button at the bottom of the player. If you want to try a version that also includes half-closed playing techniques, you can find it via this link.