Good question Alan, actually the vibrato came very easily at the tail end of a phase, almost effortlessly when the amount of air was reduced slightly. The reeds have a similar response as the Vibrandoneon in that aspect. So I just left it in. I have some Melodica’s that sound very choppy, kind of a dadadada sound instead of a wawawa which is proffered. Some melodicas you really have to work them to create a natural sounding vibrato, some just do it naturally.