Lfo Phase; The Asr Page; Trigger - Kurzweil K2661 Musician's Manual

Program Mode and the Program Editor

The ASR Page

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 K2661'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.Chapter 20 gives an example of creating a delayed
vibrato. The ASR page consists of two rows of five parameters, one row for each of the ASRs.
Parameter Group (Available for
each of ASR1 and ASR2)

Trigger

Mode
Delay
Attack
Release
Trigger
This defines the control source that starts the current layer's ASRs. The ASR starts when the
trigger switches from off to on. If the Trigger parameter is set to ON, a global ASR starts running
immediately when you select a program that contains it. A local ASR starts running as soon as
you trigger a note in the layer that contains it. Switch controls are better suited for ASR triggers
because of their binary (on/off) nature. A continuous control will trigger the ASRs when its
signal value is above its midpoint.
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Range of Values
Control Source List
Normal, Hold, Repeat
0 to 60 seconds
0 to 60 seconds
0 to 60 seconds
Default Values (for both
ASR1 and ASR2)
Off
Normal
0 seconds
0 seconds
0 seconds