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Shape & Spread
In the Hall reverbs, Shape and Spread work together to control the overall ambience of the reverberation.
Shape determines the contour of the reverberation envelope. With Shape all the way down, reverberation
builds explosively, and decays quickly. As Shape is advanced, reverberation builds up more slowly
and sustains for the time set by Spread. With Shape in the middle, the build-up and sustain of the
reverberation envelope emulates a large concert hall (assuming that Spread is at least halfway up, and
that Size is 30 meters or larger). Low Spread settings result in a rapid onset of reverberation at the
beginning of the envelope, with little or no sustain. Higher settings spread out both the buildup and
sustain.
RT High Cut
Rt HC sets the frequency above which a 6dB/octave low-pass filter attenuates the reverberated signal. It
does not attenuate the reflections. High frequencies are often rolled off with this parameter, resulting in
more natural-sounding reverberation. Setting a low frequency for this parameter can actually shorten the
reverb time, as it damps the audio as it recirculates.
Hi Cut
Adjusts the amount of high frequency content in the reverberation tails. Higher frequency settings increase
high frequency response, creating brighter reverbs; lower frequency settings create darker reverbs with
more bass frequency emphasis.
Bass Boost Frequency
Sets the frequency at which the transition from Mid Rt to Low Rt takes place. This control should be set at
least two octaves higher than the low frequency you want to boost.
For example, to boost a signal at 100Hz, set Bass Boost Frequency to 400Hz. (This setting works well for
classical music.) Crossover works best around 400Hz for boosting low frequencies, and around 1.5 kHz for
cutting low frequencies.
Bass Boost Ratio
Bass Boost boosts or cuts frequencies below Bass Boost Frequency. The amount of boost or cut required
is highly dependent on the material being processed.
ER Time
Adjusts the amount of time before reverb early reflections occur.
ER Level
Adjusts the level of early reflections within the reverb.
Feedback Delay
Changing this parameter changes the resonant frequencies of Plate reverb.
Feedback Level
Adjusts the Plate reverb's presence and prominence.
Boing
This is a unique parameter to the Spring reverb, designed to increase or decrease the amount of spring
rattle that is a physical characteristic of spring tank reverbs.
Soundcraft Vi1™ User Guide Issue 0810
Page 20 - 13
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