Yamaha SY99 Owner's Manual page 78

Other ways to control the
filter
Set both filters 1 and 2 to LPF and 9.510kHz, and set Velocity Sens = +7. Play
notes on the keyboard, softly and then strongly. Notice that as the keyboard is
played more strongly, the tone is brighter. This is because the velocity sensi-
tivity setting of +7 allows the key velocity to increase the cutoff frequency of the
filter.
Increasing the Resonance setting will boost the frequencies at the cutoff
point, making the effect of the filter more noticeable.
The SY99 provides many ways to control the filter in addition to key velocity.
EG: Each of the two filters has its own independent EG, which can be be
used to give each note a fixed pattern of tonal change, such as the characteristic
"whaaa" of a brass instrument.
Note Number: The note number can affect the rate at which each filter EG
changes the tone, and/or affect the width of the change in tone. For example high
notes can be made to change in tone more rapidly than low notes, or low notes
can be made to change in tone more than high notes.
Key velocity: Key velocity can be used to affect the amount of tonal change
produced by each filter EG. For example strongly played notes can be made to
have a greater change in tone.
LFO: Wah-wah (cyclical tone change) occurs when the LFO is applied to
the filter block.
Controllers: A specified controller (such as modulation wheel or foot con-
troller) can be used to adjust the depth of the wah-wah (Filter Modulation)
caused by the LFO.
For example to assign MODULATION 2 to filter depth, you must
1. go to System Utility, 3. Controllers (JUMP #803) and make sure that
controller number 13 is assigned to MODULATION 2.
2. go to Voice Common Job 12.Controller Set (JUMP #226) and press F3
(Mod)
3. select controller number 13 to affect filter depth
4. go to element filter page (for an AFM element JUMP #249, for an AWM
element JUMP #265), assign Filter to be controlled by LFO,
5. adjust LFO cutoff sensitivity for the amount of control you wish.
6. If the LFO has already been assigned to affect filter cutoff, you may wish
to decrease the LFO F.Mod Depth (for an AFM element JUMP #244, for
an AWM element JUMP #261).
Or, a device can be used to directly control the filter EG, for example allowing
you to use a controller to continuously adjust the tone during a note.
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