Yamaha DX21 - Manual (Page 32)

A8: LFO SPEED
Permits setting the speed of the low frequency oscillator. The data range is from
0 to 99. 0 corresponds to the slowest LFO speed (0.06 Hz), and 99 corresponds
to the fastest LFO speed (50 Hz).
A9: LFO DELAY
Permits setting a delay of between 0 and approximately 3 seconds before the LFO
modulation effect begins after a key is played. This is particularly useful for simulating
brass instruments, human voice, etc., in which the a vibrato effect is gradually applied
after the note has been initiated.
The data range is from 0 to 99. At 0 there is no delay, and a setting of 99 produces
a delay of approximately 15 seconds. With longer delay settings the modulation
effect begins gradually for a remarkably natural sound.
A10: LFO PMD
This parameter sets the depth of pitch variation produced by LFO modulation for
all operators simultaneously. This function is independent from pitch modulation
produced by the modulation wheel and breath controller, and is always ON once
set.
The data range is from 0 to 99. At 0 pitch modulation is OFF, and a setting of 99
produces the greatest pitch variation, dependent on the PITCH MODULATION
SENSITIVITY setting, described below (A13). When the PITCH MODULATION
SENSITIVITY parameter is set to maximum (7), the maximum pitch variation (PM
DEPTH = 99) will be plus and minus 1 octave.
Even if this parameter is set to 0, pitch modulation can still be applied via the
modulation wheel or breath controller.
A11: LFO AMD
This parameter sets the depth of amplitude variation (tremolo or wow) produced
by LFO modulation for all operators simultaneously. This function is independent
from amplitude modulation produced by the modulation wheel or breath controller,
and is always ON once set.
The data range is from 0 to 99. At 0 amplitude modulation is OFF, and a setting
of 99 produces the greatest variation, dependent on the AMPLITUDE MODU-
LATION SENSITIVITY setting (A14). When the AMPLITUDE MODULATION
SENSITIVITY parameter is set to maximum (3), the maximum amplitude variation
(AM DEPTH = 99) will be plus and minus 42 dB peak-to-peak.
Even if this parameter is set to 0, amplitude modulation can still be applied via the
modulation wheel and breath controller.
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