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Slew Limiter Unit

Limits the rate at which a signal can change.
Slew Limiter


The purpose of this unit is to limit how fast a signal can change. However, this unit operates in a very different fashion from the typical (linear) low-pass filter. The slew limiter tries to track the incoming signal but never changing more than a given rate. This maximum rate-of-change is determined by the Slew Limiter’s time parameter (see below).

Some applications are:

  • Pitch glide (fixed rate portamento)
  • Rate control
  • Turn gates into ramps.

Keep in mind that sometimes what you are really looking for is an Envelope Follower. So please check that out too.



Time required to ramp up or down by 1.

This time value is use to determine how long it takes for the output value to change by 1 (i.e. full-scale starting at zero). So if the time value were set to 100ms, and a 0-to-1 step signal were fed to the input of this unit, then output would be a ramp that reaches 1 exactly 100ms after the input signal reached 1.



Apply rate limiting to up, down, or all changes.
  • up: Only apply rate limiting to increases.
  • both: Apply rate limiting to all changes.
  • down: Only apply rate limiting to decreases.

See also