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.
The B footjoint also adds weight to the overall instrument which increases resistance and results in producing an overall darker tone versus the brighter tone of a C footjoint. The B footjoint improves the overall pitch of the third octave. The B footjoint is the standard choice on flutes above the student level. All Azumi flutes come with a B footjoint.