Yamaha digital mixing studio 01x User Manual

Page of 156
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.