Yamaha SPX1000, Operation Manual

Page: 32 / 79

PARAMETERS ACCESSED BY THE INT PARAM
KEY
NOT AVAILABLE
COMPRESSOR & EXPANDER PROGRAMS
36. COMPRESSOR
This extremely versatile compressor program allows creation
of a wide range of compression and limiting effects. It can
simply be used to reduce the dynamic range of a signal, to
smooth out the sound of an electric bass or add sustain to an
electric guitar. It can help to reduce volume fluctuations as a
vocalist moves closer to or away from a microphone, or limit
the maximum level of a signal to prevent overloading certain
types of amplification of recording equipment. The
COMPRESSOR program is a stereo compressor in which the
higher signal level + left- or right-c is used for gain
control.
PARAMETERS ACCESSED BY THE PARAM KEY
Attack Time (ATTACK): 1 – 40 milliseconds
Determines how long it takes for full compression to be
reached after the effect is triggered (i.e. the THRESHOLD
level is exceeded). The right ATTACK setting is essential to
preserve the natural initial attack sound of the instrument used
— or modify it as desired.
Release Time (RELEASE): 10 – 2,000 milliseconds
Determines how long it takes for compression to be released
after the input signal drops below the THRESHOLD level.
The RELEASE setting is important to preserve the natural
release sound of the instrument used. Too short a RELEASE
setting will cause the sound to be cut off unnaturally.
Threshold Level (THRESHOLD): -48 – -6 dB
Determines the level of the input signal at which the
compression effect begins. Set at a low level (-48 dB) all input
signals will be compressed. At a higher level, only those
signals exceeding the THRESHOLD level will be compressed,
thus producing a limiting effect. The THRESHOLD level
must be set to match the level and characteristics of the
instrument being used, as well as the desired effect.
Compression Ratio (RATIO): 1 – 20
This parameter sets the “amount” of compression applied to
the input signal. A setting of 1.0 produces no compression,
while a setting of 20 produces maximum compression.
Expansion Threshold (EXPAND THRS): -72 – -30 dB
Expansion Ratio (RATIO): 1–5
These parameters can be used to cut out low-level noise.
Expansion is applied to signal levels below the set expander
threshold.
Initial Delay Time (DELAY): 0.1 – 2300 milliseconds
Determines the time delay between the direct sound and the
compressed effect sound.
Detect Delay (DET. DLY): -50 – +50 milliseconds
This parameter sets an initial delay between the time the input
signal begins (the time the THRESHOLD level is exceeded)
and the time the compression effect begins. This delay can be
used to allow the initial attack of an instrument to come
through completely unaffected while the rest of the signal is
compressed. A minus DET DLY setting causes the
compressed sound to appear before the direct instrument
sound.
PARAMETERS ACCESSED BY THE INT
PARAMETER KEY
Detector High Pass Filter Frequency (DET. HPF):
THRU, 500 Hz – 8 kHz
Allows compression to be applied to a specific range of
frequencies. Compression is only applied to frequencies
higher than the set DET. HPF frequency. Compression is
applied to all frequencies when this parameter is set to THRU.
29