"I might be wrong but just a little thing I've been thinking about:
Some years ago the word curbing was the answer to all "what mode is he singing in". Then I think CVT has changed somewhat and I think that curbing as it is described now is not as dominating as it was. The new answers are medium overdrive / medium edge and/or something-something-like-something. And sometimes curbing. I'm not sure if this is in the newest book or if it will be in the next one, but at least I think that is what the new CVT-teachers are being taught these days.
This is somewhat confusing because while CVT gave people a consistent terminology for a little while, there are now different versions of CVT and different people might have read different editions. Also old questions on the CVT-forum might have outdated answers. This leads to uncertainty.
Case in point:
The page http://completevocalinstitute.com/vocal ... cal-modes/ is really nice, but is it 100% up-2-date? I don't know!"
Nowadays, CVT people are a lot more reluctant to say something is curbing, because medium overdrive and medium edge now exist. I have a few questions about this. i) Are medium overdrive and edge still 'full metallic'? and ii) Why has this change of classification occurred? Was there some specific evidence that caused CVI to categorise certain sounds as edge or overdrive that used to be curbing?