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Reverb Parameters
Reverb (Reverberation) The continuing sound in a closed space after the source has stopped emitting sound. Reverb is caused by multiple reflections whose amplitude decreases over time. As the sound bounces around the room, the reflected sound waves get closer together, merging into one continuous sound which is called reverb.
1. Density The "average" amount of time between reflections. Minimum density produces and open or spacious sound, while maximum density produces a tighter sound.
2. Diffusion The number and complexity of the reflections that make up reverb vary according to the size, shape, and contents of the environment. The complexity of the reflections is called diffusion. Minimum complexity yields a clear "transparent" reverb sound. As the diffusion is increased, the sound becomes richer, and more complex.
3. Early Reflections The first group of reflections that occur after the direct sound, but before the more dense and complex reflections that are reverb. They are used by the ear/brain as clues to the distance of the direct sound from the receiver (the ear or mic).
4. High Frequency Reverb Time (HF Decay Time) Reverb decays at different rates depending on the frequency. The higher the frequency, the more the sound tends to be absorbed by the surfaces, air, and the contents of the space. This reverb parameter allows you to control the HF decay rate in relation to the overall decay time.
5. High Pass Filter (HPF) This parameter controls the amount of low frequency energy present in the reverb sound.
6. Initial Delay (Pre-Delay) The time (delay) between the direct sound and the first of many reflections that constitute reverb. This parameter is measured in milliseconds (1000 milliseconds = 1 second).
7. Listening Position This parameter allows the engineer to change the position of the listener from front, center, or rear of the space with respect to the source.
8. Liveness This controls the rate at which the early reflections decay. A live room will have highly reflective surfaces.
9. Low Frequency Reverb Time (LF Decay Time) Lower frequencies decay at a slower rate that than high frequencies. This parameter allows youto contorl the LF decay rate in relation to the overall decay time.
10. Low Pass Filter (LPF) This parameter controls the amount of high frequency energy in the reverb sound.
11. Non-linear Reverb (Gated) The decay portion of the reverb is truncated rather than allowed to decay naturally. This is done by using the Threshold (Trigger Level), Trigger or Threshold Delay, Hold, and Relaease parameters.
12. Reverb Decay (Decay Time, Reverb Time, RT60) It is the time it takes for the reverb portion of a sound to diminish by 60 dB.
13. Reverse Reverb The intensity of the early reflections and reverb build up to a peak and then decay rather abruptly. This is the opposite of how a natural reverb would develop. This should be confused with true pre-echo or pre-reverb where you hear the actual revrb before the source. You'll need to turn the tape over to achieve this effect. Reverse reverb, while having a reverse envelope, still occurs in real time. To hear the effect being triggered by a source, before the source, you must turn the tape over, or have a sampler that plays backs in reverse.
14. Room Size (Height, Width, Depth) This parameters allow the engineer to define the dimensions of the virtual accoustic space.
15. Wall Variance This parameter allows the engineer to change the angles between the walls in the virtual accoustic space. The space can be any shape from square to asymmetrical, depending on the power of the processor's algorithm.
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