Overblow Transitions

The easiest and most effective way to obtain a transition with overblow is to attack the overblow sharply as to select a clear harmonic tone and then lowering the air pressure and the dynamics in a diminuendo which also leads to a descent of the harmonics:

Listen

Since the gradual onset of harmonics is more difficult, because it may easily produce unwanted noises, squeaks or multiphonics, it is most effective as a short "levare" gesture followed by a staccato overblow:

Listen

Combining a gradual attack and decaying is also possible, but it may be difficult to produce a real smooth transition, so this can be substituted with similar gestures employing labium, for example.