A glissando is a musical term of Italian origin that designates the continuous sliding of a sound in an upward or downward movement.

The glissando can be produced by the human voice and, among other things, by stringed instruments and the slide trombone. A glissando effect can be produced on fixed pitch instruments such as the piano and the harp by a fast sliding movement.

Fonofone: the pitch/speed modulator and the transposer are used to perform glissando effects on fixed pitch sounds, either in continuous pitch variation or in chromatic degrees if the magnet has been activated.