Yamaha PLG150DX Owner's Manual download pdf (Page 11)

FM Tone Generation

Feedback

Each algorithm has a special feedback loop, programmed to a ﬁxed location in the algorithm. With

feedback, a modulator’s output is connected to its own input, so that it modulates itself. This can be

used to increase the harmonic content of the sound, making it more rich and complex. When set to a

high level, feedback can generate noise effects — making it useful for percussive voices, metallic

sounds, and distortion effects.

Some algorithms feature a feedback loop that takes in two or three operators as a group. One such

example is algorithm 4 shown below, in which the output of operator 4 is returned to the input of

operator 6, thus modulating the entire stack. This provides even greater possibilities for tonal varia-

tion and richness.

Algorithm 4

Feedback loop

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 67 68

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Yamaha PLG150DX Owner's Manual Page 11