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WaterVerb is a Feedback Delay Network (FDN) algorithmic reverb effect using 8 delay-lines, based on open-source code originally developed by Sean Costello (who later founded Valhalla DSP). Our first implementation was called “Reverb-C” (C for Costello), and this is still reflected in the GUI, although we changed the effect name to “WaterVerb” due to its characteristic underwater-like sound.


WaterVerb has four control knobs, each corresponding to an identically-named parameter available for modulation, as follows:

  • Feedback: sets the amount of feedback (percentage, default 70%)
  • LP Cutoff: cutoff frequency of the low-pass filter in the feedback path (20 Hz to 20 kHz, default 10 kHz)
  • Dry/Wet Mix: sets the mix between the “dry” (unprocessed, input) signal and the “wet” (processed) signal at the output (percentage, default 50% i.e. even mix of dry and wet)

Tips and Tricks

  • The higher the Feedback setting, the longer the reverb tail rings out
  • Setting Feedback to 100% causes the feedback to ring out almost forever. This is similar, but not identical, to the “freeze” function available on some reverbs (including our own HallVerb.
  • Increase LP Cutoff for a bright sound, set very low for a dark sound.
  • When using this or any reverb effect on an AUX layer, set Dry/Wet Mix to 100%. When using as an in-line effect on an INST layer, you would normally keep the Dry/Wet Mix below 50%. Low values can be subtle but quite effective.
water-verb.txt · Last modified: 2021/09/02 22:03 (external edit)