Kurzweil PC3, Musician'S Manual

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9-22
Effects
Tremolo and AutoPan
Vibrato/Chorus
The Vibrato/Chorus algorithm (and also the KB3 Effects algorithm) simulates the vibrato and
chorus effects on a tone wheel organ, and is used in conjunction with the Rotary Speaker. It has
several unique parameters:
VibChInOut is an in/out switch for the Vibrato/Chorus effect.
Vib/Chor is the type of Vibrato/Chorus effect to be used. The choices are from three vibratos,
“V1”, “V2”, “V3”, or three choruses, “C1”, “C2”, “C3”.
Tremolo and AutoPan
Tremolo is amplitude modulation using an LFO. AutoPan moves the signal between the left and
right channels, using an LFO. They have several parameters in common and several unique
ones.
LFO Rate is the rate of the LFO. The range is 0 to 10.00 Hz, or in Tremolo BPM algorithm, 0 to
12.00
x the tempo.
Rate Scale multiplies the speed of the LFO rate into the audio range. The range is 1 to 25088 x .
When above 16 x , the values increment in semitone steps. When the LFO Rate is set to 1.00 Hz,
the value of this parameter is equal to the LFO frequency in Hertz.
LFO Shape is the waveform type for the LFO. Choices are Sine, Saw+, Saw-, Pulse, and Tri.
LFO PlsWid or Pulse Width . When the LFO Shape is set to Pulse, this sets the pulse width as a
percentage of the waveform period. When the width is set to 50%, the result is a square wave.
This parameter has no effect if other waveform types are chosen. Range is 0 to 100%.
AutoPan
Origin determines the axis for the panning motion. At 0%, the panning is centered between the
speakers. Positive values shift the axis to the right, while negative values shift it to the left. At
-100% or +100% (the range limits), there is no panning action.
ImageWidth is the width of the original input program material before it is auto-panned. At 0%
(minimum), the input image is shrunk to a single point source, allowing maximum panning
excursion. At 100% (maximum), the original width is maintained so no panning can occur.
Pan Width controls the amount of pan excursion. It is the percentage of total panning motion
available after Origin and ImageWidth are set. Range is 0 to 100%.
CentrAtten (Attenuation) is the amount the signal level drops as it is panned through the center
of the stereo image. For the smoothest tracking, a widely accepted subjective reference is -3dB.
Values above -3dB will cause somewhat of a bump in level as an image passes through the
center, while values below -3dB will cause a dip. Range is -12 to 0 dB.
Tremolo
Depth controls the amount of attenuation applied when the LFO is at its deepest excursion
point. Range is 0 to 100%.
LFO Phase shifts the phase of the tremolo LFO relative to the beat reference. Range is 0.0 to
360.0 degrees.