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That the ideal accord is where the 'impacts' are more or less equalised is misleading. In most fine fragrances you will find that it is not 1:1 in intensity, comparing materials in an accord according to their parts in a formula and odor value. It is why an accord is better described as a harmony rather than balance, as you're not aiming for equality. Obvious examples, without having to look at formulas, would be Vent Vert and Ma Griffe.
An essential difference since this talk was given over 11 years ago is that now generally Mass Spectrometers use Quadrupole detectors where after the gas molecule with material enters the MS from the GC column and passes over a filament that fragments the molecules, knocking off electrons and producing a charge, the m/z or mass to charge ratio, on each fragment. The charge allows the fragments to be drawn into an electromagnetic field between 4 electromagnetic poles. The charges on the poles cycle through settings that allow only 1 fragment type based on is m/z ratio to traverse the path and hit the detector which counts and calculates each fragment's mass and relative abundance to all the fragments of the whole molecule as the detector cycles through a range of molecular sizes over and over again at lightening speed. The Spectra is then compared to a several hundred thousand Spectra of chemicals in a database and the closest matches with their probability listed.
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