The presentation concerns the simulation of disordered voices. The phonatory excitation model is based on shaping functions, which are nonlinear memoryless input-output characteristics that transform a trigonometric driving function into a synthetic phonatory excitation signal. The shaping function model enables controlling the instantaneous frequency and spectral brilliance of the phonatory excitation via two separate parameters. The presentation demonstrates the synthesis of different types of dysperiodicities via a modulation of the amplitude and instantaneous frequency of the harmonic driving function. The voice disorders that are simulated are short- and long-term perturbations of the vocal frequency and cycle amplitude, biphonation, diplophonia and raucity. Acoustic noise due to turbulent airflow is modeled by means of additive white noise.