Chapter 3 - Overview

Input High Frequency Roll Off

This is a lowpass filter that can be set between 200Hz and 20kHz, and attenuates all frequencies above this value by 6dB per octave.

Predelay

All the reverb effects also have pre-delay parameters. Predelay slightly delays the reverb itself up to 250 ms, so that the dry signal more easily stands out from the reverb. A bit of predelay can make certain instruments (such as snare drums) sound bigger.

Predelay Mix

This allows you to balance the amount of predelay to direct signal as a percentage of each. This gives you the ability to hear a bit of the reverb before the loudest part of the reverb (the predelayed reverb) sounds, and makes for a bigger, smoother sounding reverb.

Reflection Level and Spread

This is only used with the more complex reverb algorithms, such as Room 2, Hall 2, Plate 2, Chamber 2 and Large Plate. Level controls the amplitude of the early reflections. Spread controls the reflectionÕs density, or how close they are together.

Reverberation Swirl

This adds a type of stereo chorus-like the effect to the output of the reverb. Only used in Room 2, Hall 2 and Large Plate, this parameter is most useful for smoothing the decay of the reverb when set at a low value. When set to a high value, it creates a more dramatic detuning effect.

Reverberation Attack

Only used in Plate 2 and Chamber 2, this controls the amount of extra signal added to the beginning of the reverbÕs effect, which in turn controls the intensity of the reverbÕs attack.

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Q20 Reference Manual