Hey Francis, so pleased you are enjoying the course. I have experimented with the ventricular cords for the low harmonic drones but only limited research with falsetto so far (but I have a killer falsetto voice after a vodka or two!!!). In a random kind of way there is a relationship and I will be discussing this further in the extended range of the Ultimate Level but as it stands falsetto vibrates on a different part of the vocal cords and altissimo vibrates from a different part of the lips in the altissimo register after reflection stops above high C (ish) More to come but stay your path!!! 😉