There are basically two types of flutes: Student Model or Intermediate/Advanced flutes. ... Intermediate or Advanced (sometimes called Professional) flutes generally always have one more key on the foot joint which allows them to play one note lower. The low B is the very lowest note this type of flute has.
Is there a BB flute?
The Bb flute, like band instruments in general, was a transposing instrument - the music written for it presented as if in D. ... The logical starting place is the standard 8-key flute as we see at the top. It has 6 finger holes to handle the basic scale, and a number of keys between 4 and 8 to fill in the chromatic gaps.