Yamaha SY99 Owner's Manual page 22

Traditional FM: The AFM tone generator can be used alone to produce any
sound that the DX series was capable of, and much more.
AWM sample playback: The AWM tone generator can be used to play back
high quality digital samples from internal AWM memory or an optional
waveform card.
AWM sample playback mixed with FM: The sounds of the AWM and AFM
tone generators can be layered.
FM modulated by AWM: AWM digital samples can be used to modulate
one or more operators in an FM algorithm, for very complex FM sounds.
AWM sample playback + FM modulated by AWM: In a variation of
original sound of the AWM sample can be mixed with the complex AFM
sound.
For techniques which use both AWM and AFM (
tional possibilities.
Both AFM and AWM can be used to create sustaining sounds.
The AFM and AWM tone generators can be used to create different com-
ponents of the sound, with short transient AWM waveforms used to create
an attack and the AFM tone generator used to create the sustain component
of the sound (or vice versa).
Since each voice can use one, two, or four AFM or AWM elements, these
synthesis strategies can be combined in complex ways.
, the
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