Yamaha SY35 Product Manual page 27

Elements A and C are always "AWM" elements, while B and D
are always "FM" elements. AWM stands for "Advanced Wave
Memory," Yamaha's sophisticated sampling technology that
allows high-fidelity reproduction of digitally recorded "live"
sound. FM is Yamaha's proven Frequency Modulation synthesis
technology which is capable of creating extraordinarily warm,
vibrant simulations of actual instruments, as well as an infinite
variety of original sounds. When you start programming your own
voices you can assign any of 128 preset AWM waveforms to
elements A and C, and any of 256 preset FM waveforms to ele-
ments B and D (Feature Reference manual, page 17).
The VECTOR CONTROL can be used to control the relative amount of either
level or detune between the elements of the voice — along the vertical axis only
if a 2-element voice is selected, or along both the vertical and horizontal axes if a
4-element voice is selected.
When LEVEL vector control is selected, moving the control towards one ele-
ment (A, B, C or D) increases the level of that element while decreasing the
level of the others proportionally. The VECTOR CONTROL works in a similar
way when DETUNE vector control is selected — moving the control towards
one element increases the pitch of that element while decreasing the pitch of the
others.
The following diagrams should give you a rough idea of how the level or
pitch of each element in a 4-element voice is affected by VECTOR CONTROL
motion.
23