Kurzweil PC3LE Musician's Manual page 95

Program Mode
The Program Editor
Maximum Rate
This is the fastest possible rate for the LFO. When its Rate Control is set to ON, or when the
control source assigned to it is at its maximum, the LFO runs at its maximum rate.
Rate Control
Assign any control source in the list to modulate the LFO's rate between its minimum and
maximum. A continuous control like the Mod Wheel is a natural choice, enabling you to get just
about any rate between minimum and maximum. But you can use a switch control too, to get
just the minimum or maximum with nothing in between. Assigning MPress (aftertouch) as the
rate control for an LFO vibrato gives you an easy way to increase the vibrato rate in realtime, as
you can on many acoustic instruments.
LFO Shape
The shape of the LFO waveform determines the nature of its effect on the signal its modulating.
An easy way to check the effects of the different LFO shapes is to set LFO1 as the value for the
Src1 parameter on the PITCH page, and set the Depth for Src1 to 400 cents or so. Then go to the
LFO page, set the Min and Max rates for LFO1 at 0.00 Hz and 4.00 Hz or so, and set the Rate
control to MWheel. Now play your MIDI controller and you'll hear the LFO's rate change when
you move its Mod Wheel. Select different LFO Shapes and check out the effect on the pitch.
LFO Phase
Use this parameter to determine the starting point of the LFO's cycle. One complete cycle of the
LFO is 360 degrees. 0 degrees phase corresponds to a control signal value of 0, becoming
positive. Each 90‐degree increment in the phase represents a quarter‐cycle of the LFO.
When an LFO is local, the phase parameter gives you control over the starting point of the LFO
for each note (for example, you could make sure every vibrato started below the pitch you
played instead of at the pitch you played). The LFO's phase also affects global LFOs, although
it's often indistinguishable, since global LFOs start running as soon as the program containing
them is selected, even if you don't play any notes.
The ASR Page
ASRs are three‐section unipolar envelopes—attack, sustain, and release. The PC3LE's ASRs can
be triggered by a programmable control source, and can be delayed. ASR1 is always a local
control. ASR2 is local by default, but becomes global if the Globals parameter on the COMMON
page is set to On. ASRs are frequently used to ramp the depth of pitch or amplitude in a vibrato
or tremolo, enabling delays in those effects. The ASR page consists of two rows of five
parameters, one row for each of the ASRs.
6-43