try this one: there is a 'heavy' mechanism and a 'light' mechanism (see meribeth bunch on the subject). both can be adducted or, not. male singers, in general, and a lot of non classical female singers (most or, some of the time) sing in 'heavy' mechanism. female singers of classical and some musical theater rep. and counter-tenors sing in a 'lighter' mechanism (the E string on a violin is of lighter guage than the G string so, this is not intended to belittle 'lighter' guage).
the confusion comes from the wide variety of resonance schemes available to all singers. high larynx, low larynx, different pronunciation of vowels, differently shaped vocal tracks, etc., all affect the signal from the vocal folds. the signal from the vocal folds is not as varied from voice to voice as is the effect of resonance from voice to voice. adding to the confusion is our inadequate descriptions of these differences that result in conversations that resemble blind people discussing color.
if the majority of the pitches one has to sing fall within the range of one guage of mechanism, it stands to reason that one should take advantage of that mechanism unless the sounds it produces are unacceptable. having chosen a a mechanism to sing with, we are sometimes challenged by having to sing pitches that lie at the extreme of that mechanism's capabilities. in these instances, we are faced with having to make a choice between switching mechanisms or extending the one we usually use. should we decide to switch for such passages, if we don't want that switch to be apparent, we have to cover it by using some kind of resonance adjustment to disguise it.
there are some, yodelers, various pop singers (whitney houston, mariah carey, jeff buckley, etc.), some country singers like leann rimes who switch back and forth without disguising the switch. there are some who switch back and forth but make the switch longer and more gradually over the course of their entire range (caetano veloso comes to mind. tako, in the samples i've heard of your singing, this seems to be what you do as well).
i can't remember what else i was going to say...oh well, don't relax...i'll probably think of it.
mike
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