Yamaha SY99, Owner'S Manual

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Simple editing: vibrato (LFO)
The LFO produces a 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 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 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 06:LFO. If element 1 is ATM, 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.
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Other LFO parameters —
Speed and Wave
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
Press EXIT to return to the Element 1 job directory, and select 05:Sensitv
(sensitivity).
Increase the modulation
sensitivity for an AWM
element
to 0. n