The D is based on a Prattens perfected by Boosey and Co with a lot of work of my own to make it a viable instrument for modern playing. The Eb is an instrument of my own design designed to compliment the D flute.
The D flute, whether keyed or keyless is the mainstay of modern folk flute playing. My D flute is large holed and powerful. Tuned and voiced to A=440Hz (modern concert pitch)
The Eb flute is just a semitone higher but adds a startling level of liveliness. It maintains a loud and powerful sound but the sound becomes even more flexible and expressive.