by Quilcom
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Harpverb is a tuned chromatic reverb effect with a MIDI control input. Unlike a conventional reverb, it uses a bank of 61 tuneable resonating comb filters to give a string-like sound.

The basic idea is to simulate the sound of chromatically tuned strings, to provide the kind of sound you’d get by making a noise into a harp’s sound box, or a piano, with the damper pedal pressed. This is called sympathetic resonance. This means you could add sound to a dry piano source to simulate sympathetic string resonances.

Since it has a MIDI input it allows you to use the sustain pedal to control damping, like on a real instrument (or control it from the GUI). However, it can do much more than this, using the controls on the front panel to deviate from the basic function.