Yamaha 01X - Manual (Page 123)

Before Using
Basics Section
Appendix
Getting Started
Reference
01X Owner’s Manual
123
Parameter Lists
● Expander (EXP) parameters:
Threshold (THRESH) determines the level of input signal
required to trigger the expander. Signals above the threshold
pass through unaffected. Signals at and below the threshold
level are attenuated by the amount specified using the Ratio
parameter.
Ratio controls the amount of expansion — the change in output
signal level relative to change in input signal level. With a 2:1
ratio, for example, a 5 dB change in input level (below the
threshold) results in a 10 dB change in output level. For a 5:1
ratio, a 2 dB change in input level (below the threshold) results in
a 10 dB change in output level.
Attack controls how soon the signal is expanded once the
expander has been triggered. With a fast attack time, the signal
is expanded almost immediately. With a slow attack time, the ini-
tial transient of a sound passes through unaffected.
Release determines how soon the expander returns to its nor-
mal gain once the trigger signal level drops below the threshold.
Out Gain (GAIN) sets the expander’s output signal level.
Knee sets the transition of the signal at the threshold. With a
hard knee, the transition between unexpanded and expanded
signal is immediate. With the softest knee, knee5, the transition
starts before the signal reaches the threshold and gradually
ends above the threshold.
● CompanderH (CPH) and CompanderS (CPS)
parameters:
Threshold (THRESH) determines the level of input signal
required to trigger the compander. Signals above the threshold
pass through unaffected. Signals at and below the threshold
level are attenuated by the amount specified using the Ratio
parameter.
Ratio controls the amount of companding — the change in out-
put signal level relative to change in input signal level. With a 2:1
ratio, for example, a 10 dB change in input level (above the
threshold) results in a 5 dB change in output level. The hard
compander (CPH) has a fixed ratio of 5:1 for expansion and the
soft compander (CPS) has a fixed ratio of 1.5:1 for expansion.
Attack controls how soon the signal is companded once the
compander has been triggered. With a fast attack time, the sig-
nal is companded almost immediately. With a slow attack time,
the initial transient of a sound passes through unaffected.
Release determines how soon the compander returns to its nor-
mal gain once the trigger signal level drops below the threshold.
Out Gain (GAIN) sets the compander’s output signal level.
Since the gain or level of the sound increases depending on the
Threshold and Ratio settings, use this to adjust the overall
sound output.
Width is used to determine the distance, in decibels, between
the expander and the compressor. With a width of 90 dB, the
expander is effectively switched off and the compander is simply
a compressor-limiter. With a smaller width (30 dB) and a high
threshold (0 dB), the compander is an expander-compressor-
limiter.
Compander
-70
-60
-50
-40
-30
-20
-10
0
+10
+20
-70 -60 -50 -40 -30 -20 -10 0 +10 +20
Input Level
Output Level
dB
dB
Threshold
Width
A compander is a compressor-expander — a combination of signal compres-
sion and expansion. The compander attenuates the input signal above the
threshold as well as the level below the width. For very dynamic material, this
program allows you to retain the dynamic range without having to be concerned
with excessive output signal levels and clipping. This functions as a limiter when
the input level exceeds 0 dB.