Yamaha PLG150-VL Owner's Manual download pdf (Page 13)

FM Tone Generation

If the “F COARSE” for the modulation in this situation is changed to 2.00, the frequency ratio

becomes 1:2, and the odd numbered harmonics, the ﬁrst, third and ﬁfth and following harmonics will

be generated. This harmonic conﬁguration is called a rectangular wave, and is used for creating wood-

wind voices for like clarinet and oboe.

Furthermore, if “F FINE” is set so that the frequency ratio is not a whole number, many non-integer

overtones will be produced. The sound can be used for creating metallic sounds, the noise when

strings are hit with something, or breath noise.

(3) Feedback Level

As we saw earlier, feedback is a function in which a modulator’s output is connected to its own input,

so that it modulates itself. Increasing the feedback level increases the harmonic content of the sound,

making it brighter and complex. Keep in mind that the total effect also depends on the output level of

the feedback-applied operator; if that operator’s output level is set to “0,” feedback level will have no

affect on the sound.

(4) EG (Envelope Generator)

The EG (Envelope Generator) parameters allow you to shape the sound of the voice. In other words,

these determine how the level of the voice changes over time, from when a key on the keyboard is

played until it is released and the sound dies out.

The EG parameters let you reproduce the sound of acoustic instruments, and their natural patterns of

attack, sustain and decay. For example, the sound of a piano has a very sharp attack and a moderately

long sustain: The sound gets loud the instant a key is played, and gradually fades away as the key is

held. The tone or timbre of the sound also changes in time, with the sound starting out very bright and

gradually growing warmer and softer (as the harmonics start to fade).

Since each operator has its own EG, the PLG150-DX gives you comprehensive and dynamic control

over both the volume and timbre of the voice, letting you accurately reproduce these natural acoustic

effects. The carrier EGs affect the volume of the sound over time, while the modulator EGs affect the

timbre.

Frequency

ratio 1:2

Frequency

ratio 1:1

Sawtooth wave Rectangular wave

Modulator

Carrier

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 67 68

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Yamaha PLG150-VL Owner's Manual Page 13