Comment: Establishing the chest voice on the bottom, then establishing more head voice in the middle, the result being freer high notes.
Quote: In principle, a "mixed" registration is in place when within a given pitch range the ratio of tension shared between the cricothyroids and the arytenoid muscular complex is inequitable. ... Most vocal faults can be directly attributable to a "mixed" registration, whose cure is solely dependent upon two processes; one which separates (isolates) and another which combines the two register mechanisms, so that the ratio of tension distributed between them can be made more equitable. (Essays on the Nature of Singing)