Yamaha SPX90 II - Manual (Page 11)

DESCRIPTION OF PROGRAMS AND PARAMETERS
The preset programs in the SPX90II fall into the following types: REV (Reverb), ER1 and ER2 (Early Reflections),
DELAY, ECHO, MOD (Modulation), GATE, PITCH, FREEZE, PAN, VIBRATO and PEQ (parametric equalizer). Each
of these program types has a specific selection of programmable parameters.
"Parameters" indicates the separate, individual functions that make up each effect. There are two types of parameters
in the SPX90II: "invisible" parameters (non-programmable, fixed-value parameters) and programmable parameters
(those you can edit, or modify).
REV (REVERB)
Most commonly associated with musical "ambience,"
reverberation is a result of myriad reflected sound
waves within an acoustical environment, i.e. a concert
hall, auditorium, or soundstage. The SPX90II creates
extremely vibrant, natural sounding reverb.
2 .
3.
4.
5
.
■(TIME)
REVERBERATION TIME (R/T). Range: 0.3
~99.0 sec
The length of the time it takes for the level of re­
verberation at 1 kHz to decrease by 60 dB—virtually
to silence. In a live setting , this depends on several
factors: room size, room shape, type of reflective
surfaces, among others.
HIGH (High Frequency Reverb Time Ratio).
Range: 0.1 ~ 1.0
Natural reverberation varies according to the fre­
quency of the sound— the higher the frequency,
the more the sound tends to be absorbed by walls,
furnishings, and even air. This parameter permits
you to alter the reverberation time of the high fre­
quencies in proportion to the mid-frequency reverb
time.
DELAY. Range: 0.1 ~ 1000.0 msec
For a listener in a concert hall, there is a time delay
between the direct sound of the instrument, and
the first of the many reflected sounds that together
are known as reverberation. On the SPX90II, this
is known as the DELAY time.
HPF (High Pass Filter): Range. THRU, 32
Hz ~ 1.0 kHz
Permits cutting the low frequency content of the
reverb signal bfelow the set frequency. When set
toTHRU, the HPF isOFF.
LPF (Low Pass Filter). Range: 1.0 kHz ~ 11
kHz, THRU
Permits cutting the high frequency content of the
reverb signal above the set frequency. When set
toTHRU, the LPF is OFF.
ER1 and ER2 (Early Reflections)
"Early Reflection" effects. ER1 has fewer reflections,
and is a LOW DENSITY early reflection effect, while
ER2 has more reflections, and is a HIGH DENSITY
early reflection effect.
EARLY
DIRECT REFLECTIONS
^TYPE-
(dB) SIGNAL
DELAY)
(TIME)
ROOM SIZE
1. TYPE. Range: HALL, RANDOM. REVERSE,
PLATE
TYPE selects the pattern of the earliest reflections
of the reverb sound. All "Early Reflection" presets
are switchable between 4 different types. These
are HALL (a typical grouping of early reflections
that would occur in a performing environment like
a hall), RANDOM (an irregular series of reflections
that could not occur naturally), PLATE (a typical
grouping of early reflections that would occur in
a plate reverb unit), and REVERSE (a series of re­
flections that increase in level, like the effect pro­
duced by playing a recorded reverb/echo back­
wards). See the E/R Mode chart on page 26.
2. ROOM SIZE. Range: 0.1 ~ 20.0
The ROOM SIZE parameter sets the time "gaps"
between the early reflections—directly propor­
tionate to the size of the room. The effect of this
parameter also depends on which Early Reflection
mode has been selected. A Room Size Chart can
be found on page 27 in this manual.
3. LIVENESS. Range: 0 ~10
Refers to the rate at which the reflected sounds fade.
Set this parameter at zero to simulate an acoustically
"dead" room, with absorbent surfaces to "soak up"
the reflected sounds. As you increase the setting,
the room appears to contain more "live" surfaces,
with the reflected sounds fading more slowly, as
they reflect from wall to wall, until at the maximum
setting the effect is of an intensely reflective envi­
ronment containing many highly polished surfaces
(tiles, glass, etc).
4. DELAY. Range: 0.1 ~ 1800.0 msec
The time delay between the direct sound of the
instrument and the first reflection to reach the
listener's ear.
5. LPF. Range: 1.0 kHz ~ 11 kHz, THRU
Same function as the LPF parameter of the REV
program.
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