Early Reflection Programs; N 14. Percussion Er; N 15. Gate Reverb; N 16. Reverse Gate - Yamaha SPX900 Operation Manual

Height Fine: -100 – +100
This sets the value specified with HEIGHT as the reference
value (0) and is the parameter for further fine adjustment.
Depth Fine: -100 – +100
This sets the value specified with DEPTH as the reference
value (0) and is the parameter for further fine adjustment.
Wall Vary Fine (W. VARY FINE): -100 – +100
This sets each of the value specified with WIDTH, HEIGHT,
DEPTH, and WALL VARY as the reference value (0) and is
the parameter for further fine adjustment.
W. Decay: RT x 0.1 – 10.0
Among the REV components, this sets the reverberation time
of the REV components specified with WIDTH to a multiplier
value corresponding to the REV TIME. It simulates the
acoustic properties of the side walls.
H. Decay: RT x 0.1 – 10.0
D. Decay: RT x 0.1 10.0
In the same way as for W. Decay, this sets a multiplier value
corresponding to REV TIME for reverberation time felt in
relation to the HEIGHT (vertical direction) in the height
direction and that felt for the DEPTH in the front-to-back
direction. It also simulates the acoustic properties of the walls
in the vertical and front-to-back directions.
PARAMETERS ACCESSED BY THE INT PARAM
These are same as REVERB Programs.

EARLY REFLECTION PROGRAMS

n
14. PERCUSSION ER
n
15. GATE REVERB

n 16. REVERSE GATE

n 17. PROGRAMMABLE ER

These effects are created using different groupings of "early
reflections" – the first cluster of reflections that occurs after
the direct sound but before the dense reflections that are
known as reverberation begin.
PARAMETERS ACCESSED BY THE PARAM KEY
Early Reflection Pattern Type (TYPE):
PERCUSSION ER: S-HALL, L-HALL, RANDOM,
PROGRAMMABLE ER: USER-A, USER-B,
GATE REVERB & REVERSE GATE: TYPE A,
REVERSE, PLATE, SPRING
USER-C, USER-D
TYPE B
In the PERCUSSION ER program the TYPE parameter selects
one of six different patterns of early reflections. S-HALL
produces a typical grouping of early reflections that would
occur in a performing environment such as a small hall.
L-HALL simulates the early reflection pattern of a larger hall.
RANDOM produces an irregular series of reflections that
could not occur naturally. REVERSE generates a series of
reflections that increase in level – like the effect produced by
playing a recorded reverberation sound backwards. PLATE
produces a typical grouping of reflections that would occur in
a plate reverb unit. and SPRING produces the same for spring
type reverb unit.
In the PROGRAMMABLE ER program the TYPE parameter
selects one of the four user-programmed early reflection
patterns: USER-A, USER-B. USER-C or USER-D. The USER
early reflection patterns are programmed using the utility-
mode "USER ER EDIT" function (see "USER ER EDIT" on
page 27 for details).
In the GATE REVERB and REVERSE GATE programs the
TYPE parameter selects either TYPE-A or TYPE-B.
Room Size (ROOM SIZE): 0.1 – 25.0
This parameter sets the time intervals between the early
reflections – a feature of natural early reflections which is
directly proportional to the size of the room.
Liveness (LIVENESS): 0 – 10
"Liveness" refers to the rate at which the reflected sounds
fade. An acoustically "dead" room is simulated by setting this
parameter to zero. Increasing the value of this parameter
creates an increasingly "live" sound, simulating an increasing
area of reflective surfaces in the room.
Diffusion (DIFFUSION): 0 – 10
The complexity of the many reflections that make up
reverberation varies according to the shape of the room and its
contents. In the SPX900 the term "diffusion" refers to the
complexity of these reflections. If the DIFFUSION parameter
is set to "0." minimum complexity and therefore a clearer,
more straightforward early reflection effect is produced. As
the DIFFUSION value is increased, the complexity of the
reflections increases producing a thicker, richer sound.
Initial Delay (INI DLY): 0.1 – 400.0 milliseconds
Initial delay is the time between the beginning of the direct
sound and the beginning of the early reflections.
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