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Refers to a note that glides from one pitch to another while it is still audible. The music term for this effect is portamento, which is a slurring between notes. In a synthesizer, this effect is created by causing the control voltage for the pitch of a note to slide from the pitch of the previous note rather than make a discrete jump. The module that creates this effect is sometimes known as a slew generator, slew limiter, slope generator, or lag.

Some use the terms glide, glissando, and portamento interchangeably, but if you want to split musical hairs, a glissando (gliss) is a different effect where the intermediate notes are more distinct – such as played rapidly in order – rather than slurred through.

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