Yamaha SY-35, Product Manual

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Set the Vector Rate
Move the cursor to the lower display line by pressing the CURSOR
key, then use the [-1/NO] and [+1/YES] keys to set the vector rate
parameter to "30ms." This is a fairly "average" vector rate, and is a good
place to start experimenting with dynamic vectors (in fact, it is the default
rate so you might not have to change the setting).
Vectors are recorded by "sampling" the position of the VECTOR
CONTROL at evenly-spaced steps. The Vector Rate function
allows you to set the time between each sample step. Quite logi-
cally, short vector rates are best for quick control movements
while longer vector rates are better for slow control movements.
If you set the vector rate to too long a value for a rapid control
movement, you may end up with a "jerky" sounding vector. The
diagrams below show the same control movement recorded at 10-
millisecond and 160-millisecond vector rates.
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