Abstract: The cornetto or zink is a Renaissance cup-mouthpiece instrument of conical bore with tone holes like those on a woodwind instrument. Its useful range includes the true fundamental mode for each fingering, and higher modes are overblown without the assistance of a vent hole. The modes for the completely closed fingering constitute a good harmonic series, while the third and higher modes for all the other fingerings are noticeably flat. There is a distinct difference in tone quality between the fundamental register and the second octave. Alternate fingerings that employ the third mode also sound quite different from the same notes played in the second mode. Four voices of the cornetto family have been subjected to a study that includes measurement of input impedance by the capillary excitation technique and spectral analysis in an anechoic chamber. An electronic system using inexpensive integrated circuits has been used to make the impedance measurements.