Yamaha DX7 II FD Reference Manual page 17

Speed
The speed parameter adjusts the frequency of the LFO.
0 LFO frequency is 0 (LFO oft).
99 Maximum LFO frequency.
Try the entire range of speeds to become familiar with this parameter's effect.
Delay
Most acoustic musical sounds do not begin with vibrato or tremolo immediately. These
expressive techniques are usually employed after a certain delay. This parameter allows
you to simulate this by specifying a delay time before the LFO signal is applied.
0 No delay time. LFO is applied from the beginning of each note.
99 Maximum delay time.
Experimentation is the best way to become familiar with the effect of this parameter.
Mode
This parameter can also be called the trigger mode. It is used to specify whether you wish
all notes played
to
respond to the signal from a single LFO or to the signal from their own
individual LFOs.
S i
n
g
1 e All notes respond
to
a single LFO.
Mu
1
t i
All notes respond to individual LFOs.
The DX7 II includes 16 LFOs, one for each of the 16 notes it can produce simultaneously.
In single mode, the signal of one LFO is applied
to all
notes regardless of the rhythm or
relationship between them. The LFO is applied to the first note played and all subsequent
notes with the same phase. In multi mode, a separate LFO is invoked and applied to each
note played, so the LFOs on the various notes will not be in phase with each other. This
can be used to achieve uncanny realism in string ensemble voices, particularly with an
adequate LFO delay. Since there is only one set ofLFO parameters to specify on the
DX7 II, the parameter values apply
to
all LFOs equally.
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