Kurzweil PC3A6 [221/423] Rotating speakers

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Effects and Effect Mode

Effects Overview

Polydistort

This is a more complex distortion eect that provides two, four, or six stages of distortion.

Curve n controls the curvature of the individual distortion stages. 0% is no curvature (no

distortion at all). At 100%, the curve bends over smoothly and becomes perfectly at right before

it goes into clipping. Maximum value is 127%.

LP n Freq are shelving frequencies for one-pole lowpass lters on each of the distortion stages.

LP0 Freq handles the initial low pass prior to the rst distortion stage. The other low pass

controls follow their respective distortion stages. Range is 16 to 25088 Hz.

Rotating Speakers

An eect that includes Rotating Speakers breaks the signal into two frequency bands, “rotates”

each band separately through a virtual speaker, and then combines the outputs with a pair of

virtual “microphones” whose angle relative to the speakers is adjustable. A number of very

sophisticated parameters have been included in the Rotating Speakers eect, to give the eect a

great degree of realism. Because of the complexity of the eects, you might want to approach any

parameters that seem a little obscure to you with caution.

Roto InOut engages or bypasses the rotary speaker eect.

There are four virtual microphones, with two each on the woofer (LoMic A and LoMic B) and on

the tweeter (HiMic A and HiMic B). Each microphone has:

Pos (position), the angle of the microphone from the front of the virtual speaker, from -180 to 180

degrees;

Lvl (level) from 0 to 100%; and

Pan, the left/right panning of the microphone’s output, from -100% (full left) to 100% (full right).

Other parameters:

Lo Beam W and Hi Beam W set the acoustic radiation patterns (“beam width”) of the two drivers

in the rotating speaker. If you imagine looking down on the rotating speaker, this is the angle

between the -6 dB levels of the beam. The range is from 45° to 360°. At 360°, the driver is

omnidirectional.

Xover (Crossover) is the frequency at which high and low frequency bands are split and sent to

separate rotating drivers. The range is 16 to 25088 Hz.

Lo Gain and Hi Gain are the gains of the signal passing through the rotating woofer or tweeter,

respectively. The range is O/-79.0 to 24.0 dB.

Lo Size and Hi Size are the eective sizes (radius of rotation) of the rotating speakers in

millimeters. This aects the amount of Doppler shift or vibrato of the low frequency signal. The

range is 0 to 250 mm.

Lo Trem and Hi Trem control the depth of tremolo (amplitude modulation) of the signals. It is

expressed as a percentage of full scale tremolo. The range is 0 to 100%.

LoResonate and HiResonate are simulations of cabinet resonant modes expressed as a

percentage. For realism, you should use very low settings. The range is 0 to 100%.

Lo Res Dly and Hi Res Dly are the number of samples of delay in each resonator circuit in

addition to the rotation excursion delay. The range is 10 to 2550 samples.