modern flute C foot

multiphonic C#5 & E6

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 may be compared with the fingering for A4, but with a register hole to play E6. It may also be considered as the trill fingering for D5 (C5 to D5 / C#5 to D5) with enough cross fingering to flatten it approximately a quarter tone. The 3rd and 1st minima, respectively, correspond to these pitches.

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.