The Paetzold flute contrabass in F has a 2 octave range from F1 to F#3.
F1 | F1# | G1 | G1# | A1 | A1# | B1 | C2 | C2# | D2 | D2# | E2 | F2 | F2# | G2 | G2# | A2 | A2# | B2 | C3 |
C3# | D3 | D3# | E3 | F3 | F3# |
The range can be extended up to G#3, but these additional notes are very difficult to produce with a satisfying timbre and good tuning.
The Paetzold flute is a somewhat strenuous instrument to play, as it requires a large amount of air to produce sound. For this reason, the average duration of a steady tone varies, depending on the register. Perfectly tuned notes are restricted to the "mezzo forte" dynamic level, with very little possible variations.