| The Algorithms and Their Parameters |
Shape, Spread | Rvb Design cont'd. |
In the Chamber and Infinite algorithms, Shape and Spread work together to |
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control the overall ambience of the reverberation created by the PCM 80. Shape |
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determines the contour of the reverberation envelope. With Shape all the way |
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down, reverberation builds explosively, and decays quickly. As Shape is |
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advanced, reverberation builds up more slowly and sustains for the time set by |
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Spread. With Shape in the middle, the |
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envelope emulates a large concert hall (assuming that Spread is at least halfway |
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up, and that Size is suitably large — 30 meters or larger). Low Spread settings |
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result in a rapid onset of reverberation at the beginning of the envelope, with little |
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or no sustain. Higher settings spread out both the buildup and sustain. In the |
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Inverse algorithm, Spread is fixed, and only a Shape control is available. |
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Def |
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Available in the Concert Hall and Glide>Hall algorithms, Definition affects the |
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echo density buildup rate during the latter part of the decay period. At 0, the rate |
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is determined by the program material. Raising Definition causes the sound to |
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become choppier — the decrease in density of the echoes creates increasingly |
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distinct, repetitive echo trails. |
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Depth
Available in the Concert Hall and Glide>Hall algorithms, this control sets the output amplitude envelope, changing the listener's perspective from the front to the rear of the hall.
Spin
Spin affects the movement of the reverberation tail. The object of Spin is to continuously alter the timbre of the reverberant sound. This makes the result more natural, without making the position of instruments unstable. Spin should typically be set to values between 10 and 50. Higher values may make the timbre of piano or guitar unstable.
Chorus
In the Concert Hall and the Glide>Hall algorithms Chorus randomizes delay times and introduces modulation to make reverberation sound less metallic. Increasing Chorus increases the rate of modulation. Because Chorusing can cause pitch variation, this parameter should be set with care when using sources with very little pitch wobble (such as guitar or piano). A good practice is to increase the setting until pitch wobble becomes noticeable, then lower it slightly.
Link
This control is available in all algorithms except Inverse. When Link is set to On, the reverb time (Mid Rt) and Spread scale linearly as the Size control is varied. For some special effects, Mid Rt, Spread and Size can be unlinked.
Rvb Width
In all of the
Width, but controls the audio of only the reverb and post delay reverb.
Rvb In/Out
Rvb In and Rvb Out control the level of the audio going into and coming out of the reverb effect. Rvb In has a range of Full (0dB) down to