The C# trill key is a lever activated by the first finger of the right hand to open a tone hole next to the thumb key.
The split E mechanism is designed to make the high E more responsive. This mechanism physically splits the double G keys. When playing G, the keys behave as normal, closing both of the G keys.
The G keys of a flute can be made inline or offset. There is no difference in the tone produced with inline or offset G keys, it is simply a matter of comfort and preference.
The flute’s footjoint can be built to low C or B. The B foot reaches down to a low B, one half-step lower than the C footjoint. It has one more key and the length of the tube is extended by about one inch.
An open hole flute has holes at the center of the A, G, F, E and D keys. Openholes are the standard among intermediate flutes, and are the preference of the majority of flutists.
Based on the work and recommendations of British flutist William Bennett, the Altus-Bennett scale offers excellent intonation, carefully tuned harmonics, and balanced registers.