Kurzweil PC3A8 [223/423] Tremolo and autopan

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Effects and Effect Mode

Effects Overview

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 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 16x, 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 eect 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.

50% Weight is the relative amount of attenuation added when the LFO is at the -6dB point. This

causes the LFO shape to bow up (positive values) or down (negative values). Range is -16 to

3 dB.

L/R Phase sets the phase relationship of the channels. “In” ips the left channel’s LFO out of

phase, with the result that the eect turns into an auto-balancer. “Out” leaves the left LFO alone.