Propellerhead Reason - 4.0 Instrukcja Operacji Pobierz pdf (Strona 214)

THOR POLYSONIC SYNTHESIZER

212

State Variable Filter

This is a multi-mode filter which offers 12 dB/octave slope Lowpass (LP), Bandpass

(BP), Highpass (HP), plus Notch and Peak filter modes which are sweepable be-

tween HP/LP states, similar to the vintage Oberheim SEM filter.

The filter modes are as follows:

D LP 12 (12 dB lowpass)

Lowpass filters let low frequencies through and cut off high frequencies. This filter

type has a 12dB/Octave slope.

D BP 12 (12 dB bandpass)

Bandpass filters cut both high and low frequencies, leaving the frequency band in

between unaffected. Each slope in this filter type is 12 dB/Octave.

D HP 12 (12 dB highpass)

Highpass filters let high frequencies pass and cut off low frequencies. This filter

type has a 12dB/Octave slope.

D The “Notch” and “Peak” filter modes employ a combination of two out-

puts from the same filter combining LP and HP set to the same the filter

frequency.

The “LP/HP” knob associated to these two filter modes can modulate the state of

the filter from low-pass to high-pass. If the knob is in the mid-position, you get a

Peak or Notch filter slope (depending on the mode). The HP/LP parameter can be

assigned as a modulation destination.

D This filter can self-oscillate and will produce a pitch with high Resonance

settings if this is activated.

Self-oscillation can be switched on or off by using the “SELF OSC” button. The

“KBD” knob governs how the frequency tracks the keyboard, turned fully clock-

wise will produce 12 semitones/octave tracking.

Comb filter

The Comb filter can add subtle pitch variations and phasing-like effects to sounds.

D Comb filters are basically very short delays with adjustable feedback

(controlled with the Resonance knob).

A comb filter causes resonating peaks at certain frequencies. Comb filters are

used in various signal processing devices like flangers, and produces a character-

istic swooshing sound when the frequency is swept.

D The difference between the “Comb +” and “Comb –” modes is the posi-

tion of the peaks in the spectrum.

The main audible difference is that negative Comb mode causes a bass cut.

D The Resonance parameter in both cases controls the shape and size of

the peaks.

This filter will produce a pitch with high Resonance settings combined with low

frequency settings.

Formant filter

The Formant filter type can produce vowel sounds. There are no Frequency or Reso-

nance parameters, instead you have a horizontal “X” parameter slider and a vertical

“Y” parameter slider that operate together to produce the various filter formant char-

acteristics.

D You can alter the settings of both the “X” and “Y”parameters simulta-

neously by moving the “dot” inside the gray rectangle on the filter panel.

Horizontal movement changes the “X” parameter, and vertical movement the “Y”

parameter.

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