Yamaha SY-77, Operating Manual

Page: 82 / 268

Simple editing: vibrato (LFO)
The LFO produces a cycliclly repeating pattern of change. Vibrato is created by applying the LFO to the
pitch.
What is an LFO
A Low Frequency Oscillator (LFO) is a device that produces a waveform at a
slow speed (low frequency). This slowly repeating waveform can be applied to
various aspects of the sound to cause cycliclly repeating patterns of change.
When the LFO is applied to the pitch, vibrato is the result. When the LFO is
applied to the filter, wah-wah is the result. When the LFO is applied to the
volume, tremolo is the result.
Adjust the LFO
Other LFO parameters -
Speed and Wave
Increase the modulation
sensitivity for a AWM
element
In this example we will use the LFO to add vibrato to the sound. Move to the
Voice Edit job directory, and press
F3
to get the Element 1 job directory. If ele-
ment 1 is AWM, select job 05:LFO. If element 1 is AFM, select job 06:LFO and
press
F1
to select the Main LFO.
The Main LFOs of AWM and AFM elements are the same. (AFM elements
have a Sub LFO which we will not be using in this example.)
Increase the P Mod Depth setting (Pitch Modulation Depth) while playing a
note, and you will hear vibrato. If you do not hear any change when you increase
the LFO P Mod Depth, you may need to increase the Pitch Modulation Sensi-
tivity (PMS) as explained in the last two paragraphs below.
To regulate the speed of vibrato, move the cursor to Speed and adjust the value
over a range of 0-99. Extremely high settings will result in a buzzing sound, and
extremely low settings will result in a very slow pitch change.
To modify the shape of the vibrato, move the cursor to Wave and select a
different LFO waveform. The selected LFO waveform will be graphically shown
in the line below.
Before you proceed to the next section of this example, set P Mod Depth
to 0.
Press
EXIT
to return to the Element 1 job directory, and select 04:Sensitv
70