modern flute C foot

multiphonic C5 & F#5

Impedance

Fingering a key depressed a key not depressed a part of the mechanism that is not normally touched Details in fingering legend. Acoustic schematic a closed tone hole an open tone hole Non-specialist introduction to acoustic impedance Non-specialist introduction to flute acoustics

This fingering may be considered as the trill fingering for F#4/5, but with a register hole. Simultaneously, it could be considered as the trill fingering for D#5 (C#5 to D#5), but with considerable cross fingering to lower its pitch to ~C5. The first two minima correspond to these pitches. The third and sixth minima can also be played.

For this situation to apply, the frequencies of the notes have to be such that the effect of the inertia of the air in the open tone hole is large enough to allow some transmission past the hole, but small enough to produce some reflection. For low-pitched notes, the tone hole is usually small.