The paper presents a simple, yet very effective tracking technique for time-varying sinusoidal partials within
sinusoidal and hybrid models of speech and audio. The issues of several existing tracking techniques are discussed
in the paper. We extend the classic tracking algorithm of McAulay and Quatieri by the inclusion of frequency and
amplitude skew factors estimated in the process of chirp analysis. A simple measure of frequency and amplitude
matching is proposed to support reliable pairing of detected quasi-sinusoidal peaks across successive frames.
Moreover, the paper proposes an evaluation methodology for quality assessment of tracking algorithms. 

Keywords: sinusoidal model, partial tracking, chirps, estimation, tracking quality