Roland VS-2400CD Appendices page 46

Algorithm List
Reverb
This feature adds reverberation to the sound to model the size of space such as a hall and a room.
fig.08-04
Input L
Input R
Sound types
Sounds around us can be analyzed and categorized into three types: direct sounds, early reflections and
reverberation. A direct sound is the sound that reaches the listener directly from the source. An early reflection is
the sound that has rebounded from the wall once, twice or several times. A reverberation is the sound we hear
after sound reflections are repeated many times.
fig.08-05e
Early reflections
Sound
source
Relationship between sound and time
Reflected sound reach the listener in the following sequence. The pre-delay is the time from when the direct
sound is heard until the reverb is heard. The reverb time is the time over which the reverb decays to silence.
fig.08-06e
Level
Direct sound
Pre Delay
Reverb sound quality
The sound quality of a reverb is affected by materials of the walls and other members from which the sound is
rebounded. This is because the degree of attenuation in the High and low frequency bands varies. HF-Damp Gain
and LF-Damp Gain are provided so that you can adjust such attenuation degrees. The smaller the value becomes,
the steeper the degree of attenuation of the reverberation becomes severer in the High and low frequency bands.
In addition, in order to obtain softer reverberation, make the frequency lower by using HF-Damp Frequency
(High Freqreq-Damp Freq). In order to obtain harder reverberation, make the frequency Higher by using LF-
Damp Frequency (LoFreq-Damp Freq).
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Direct Level
3BAND EQ
Direct Level
Later
reverberation
Direct sound
Listener
Early reflections
Later reverberation
Reverb Time
Output L
Reverb
Output R
Time