"this route that you can have 5 octaves like Maria Carey or some other two bit pop singer"

Sadly these techniques mean that you can usually only sing 'into a mike' - a real human voice should be able to be heard adequately 'unplugged'.... :-)

One 'can' do short occassional bursts of 'tricks' with the voice, but try too much and they will have consequences, as Maureen says...