Download Print this page

Yamaha CS-50 Servicing Manual page 13

Hide thumbs Also See for CS-50:

Advertisement

o IL (Initial Level) . . . . . . . . . . . . . . . This sets the starting point of the cut-off frequency (fc) of the VCF at the
moment a key is depressed. The fc rises from this level toward the
sustaining level.
e AL (Attack Level) . . . . . . . . . . . . .
Sets the highest level of the fc for both the VCF-HPF and the VCF-LPF to
rise after a key is depressed. The greater the difference is between the IL
and the AL, tl,e more pronounced the change of tone color from soft to
brilliant.
e A (Attack Time) . . . . . . . . . . . . . . .
Controls the time required to change the fc from the IL to the AL. For
instance, when A is long (fc rising slowly), the tone color changes
gradually from soft to brilliant, and the voltage envelope shows a gentle
slope from the IL to the AL.
®
D (Decay Time) . . . . . . . . . . . . . . .
Controls the time span from the maximum fc at the Attack Level (AL) to
the fc of constant condition (the key kept depressed: Sustain Level) of
both the fc's of the VCF-HPF and VCF-LPF.
e R (Release Time) . . . . . . . . . . . . . .
Controls the time in which the fc returns from the sustain level toIL from
the moment that the key is released.
@
VCA (Voltage Controlled Amplifier)
Controls the
ampl~tude
of the signal. Each mechanical instrument has its own pattern of changes in sound intensity
(loudness) during the rise, sustain and decay phases, and this is a very important factor in its total characteristic
tone color. For instance, the sound of a piano rises rapidly when a key is depressed and dies away quickly when it
is released; but if the damper pedal is pressed, the sound will be sustained long after releasing the key. Accordion
sound rises fairly slowly.
In order to simulate the constantly changing volume of sound from the start to the die-away in the musical
instrument, there are two ways of controlling the VCA gain: manual control with two levers (VCF and
~),
and
envelope control as same as the VCF.
Envelope for VCA (A, D, S, R)
Sets the time course of changes in loudness from the start to the die-away with the following four parameters:
@
A (Attack Time) ................ Determines the time span of loudness rising from zero to the peak level
when a key is depressed.
• D (Decay Time) ................ Determines the time span of loudness falling from the peak level to the
sustain level (see 25).
e S (Sustain Level) ............... Sets the loudness level to be sustained while the key is held down.
e R (Release Time, Sustain Time) .... Controls the time span of loudness falling from the sustain level to zero
when the key is released.
4~-----------------------------------

Advertisement

loading

This manual is also suitable for:

Cs series