(Zbyszyński, Michael, David Zicarelli, and Regina Collecchia: ICMC Perth 2013)
fzero∼ is a monophonic, wavelet-based, real-time fundamental estimation object released as part of the standard Max distribution since version 6.0. It was designed to provide usable results in a large variety of cases with a minimum of parameter modification by the user. It implements a Fast Lifting Wavelet Transform (FLWT) using the Haar Wavelet. The object provides an efficient estimation of the fundamental frequency in a large variety of real-world situations.