Lloyd,
I know you are planning to read Don Miller's dissertation, but I couldn't resist making one more comment :) .
COMMENT:
The 'call of the voice', which Richard Miller describes, is explained in Don Miller's register theory by the tendency of male singers to tune the first (lowest) formant of the vocal tract to the second harmonic of the sung tone, when approaching the passaggio. This tuning implies a raising of the larynx as pitch ascends and the resulting sound quality (with a dominant second harmonic) sounds like 'calling' or 'belting'.
Avoiding the 'call' thus implies leaving the first formant in place (a.o. by keeping a low larynx) and moving to an alternative resonance, based on the second formant and/or the singer's formant. This results in a relatively dark, but ringing vowel, in which the dominant harmonic is no longer the second, but rather the third, fourth or even fifth harmonic, depending on the vowel.
The crux of this is that learning to traverse the male passaggio (and similarly the female passaggio) seems to be simply based on 'clever' vocal tract tuning. It was quite a shock for me to learn this, since terms like 'mixing chest and head' (apart from their subjective meaning) become rather questionable.
Wim Ritzerfeld - engineer, singer and aspiring voice teacher - (in no particular order)
> To define the male passaggio area, Miller suggests that the singer sing in > his chest voice in a continuing ascending scale. When the call voice > appears one has found the lower passaggio point. When, as the singer > continues to ascend the scale the call voice gives way to either the head > voice or the falsetto, one has found the top of the passaggio area. With > this approach it is usually quite easy to know the problem area for the > male voice and then begin the process of implementing the head voice above > the passaggio and once that is accomplished , bringing that head voice down > through the passaggio and adding in the necessary chest voice but in such a > manner that the call voice is avoided. Singing down from the head voice, > adding the chest voice to create a mixed voice in the passaggio is the key > to building a male voice that does not appear to have any passaggio breaks. >
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