Roland VS-1680 Appendices page 111

How reflections and time are related
Reflected sound reaches the listener in the follow-
ing 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.ap (efx)-71 (rev_time.eps)
Level
Direct sound
Early reflections
Pre Delay
Other elements
The tonal characteristics of the reverb are affected
by the materials of the surfaces (walls, etc.) off
which the sound is reflected. The HF Damp and
LF Damp parameters let you adjust the tonal
quality as affected by such conditions.
HF Damp: The materials of the reflective sur-
face will affect the way in which the
high frequencies of the sound are
attenuated. HF Damp adjusts the
way in which the high frequencies
are attenuated. Lower values will
cause the high frequencies of the
later reverberation to be attenuated
more sharply.
The materials of the reflective sur-
LF Damp:
face will also affect the way in which
the low frequencies of the sound are
attenuated. LF Damp adjusts the
way in which the low frequencies
are attenuated. Lower values will
cause the low frequencies of the later
reverberation to be attenuated more
sharply.
Room Size
Adjust the size of the room.
Time (Reverb Time)
Adjust the time over which the later reverberation will
decay.
Later reverberation
Time
Reverb Time
Function of Each Effect Parameter
PreDLY (Pre Delay)
Adjust the time until the later reverberation appears.
Difusi (Diffusion)
Adjust the spread of the reverb sound.
Densty (Density)
Adjust the diffusive spaciousness of the early reflec-
tions.
ERLvl (Early Reflection Level)
Adjust the level of the early reflections.
LF Damp Gain
Adjust the degree of LF damping. With a setting of 0,
there will be no damping. As the value is decreased,
damping will become more pronounced.
LF Damp Freq (LF Damp Frequency)
Adjust the frequency at which LF damping will begin
to take effect.
HF Damp Gain
Adjust the degree of HF damping. With a setting of 0,
there will be no damping. As the value is decreased,
damping will become more pronounced.
HF Damp Freq (HF Damp Frequency)
Adjust the frequency at which HF damping will begin
to take effect.
HiCF (High Cut Frequency)
Adjust the frequency at which the high frequencies of
the reverb sound will be cut.
EfxLvl (Effect Level)
Adjust the volume of the reverb.
DirLvl (Direct Level)
Adjust the volume of the direct sound.
Delay
Delay is an effect that adds delayed sound (s) to the
direct sound, adding depth to the sound or creating
special effects.
Sw (Switch)
Turn the delay on/off.
Time (Delay Time)
Adjust the delay time.
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