I forgot to mention that with the /a/, /u/ octave leap, there is a deliberate yodel effect from the bottom note to the top note, as it switches from chest to head, deliberately getting the "aah - ooh - gah" car horn effect.
Other "register" exercises are the siren, from low to high and back down again, smoothly, slowly. A variation on this is the "bomb drop" which starts in upper middle voice and sirens down as low as you can.
You can also work to blend the feeling of the higher register into the lower register, for example, sopranos can sing 5 note descending scales beginning on D major, but start on the A and descend 5-4-3-2-1 and keep it as heady as possible, not letting it flip to chest. Repeat by going down half steps to Db major, beginning on the Ab and descending 5-4-3-2-1. See how low you can go without switching to chest.
Gina
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