The standard A to E range, in which it is possible to play with polyphonic embouchure on any or all diatonic notes at the same time, is shown on the left side. When playing monophonically, some additional notes are possible on certain hydraulophones, indicated here by small cue notes.

Left, the extended notes come from depressing the key changer, sharpener, and flattener. To play a low G, one must be playing in C minor (with Ab) and depress the flattener simultaneously. When playing on the high E jet, depressing the sharpener produces an F.