@support_aodyo I think he means adding the 3rd register flute fingerings. eg D3 has only 2 fingers left hand on, (index off, 2nd & 3rd fingers down.) The third register fingerings on the flute are the most difficult. 1st and 2nd are quite similar, but 3rd uses cross fingerings lifting some and pressing others not used in the first 2 octaves. I think you must give up this idea, and simply use the octave keys which simplifies this. See the Sylphyo as its own distinctive instrument, otherwise you will always struggle with this. Otherwise where do you stop wanting more similarities to the flute? For one, the D# key used mostly for venting on flute is not necessary... & there are no trill keys etc....
