Propellerhead Reason - 1.0.1 Manual de Operações descarregar pdf (Página 111)

SUBTRACTOR SYNTHESIZER

109

Filter 1 Frequency

The Filter Frequency parameter (often referred to as “cutoff”) determines

which area of the frequency spectrum the filter will operate in. For a lowpass

filter, the frequency parameter could be described as governing the “open-

ing” and “closing” of the filter. If the Filter Freq is set to zero, none or only the

very lowest frequencies are heard, if set to maximum, all frequencies in the

waveform are heard. Gradually changing the Filter Frequency produces the

classic synthesizer filter “sweep” sound.

! Note that the Filter Frequency parameter is usually controlled by the

Filter Envelope (see page 111) as well. Changing the Filter Fre-

quency with the Freq slider may therefore not produce the expected

result.

Resonance

The filter resonance parameter is used to set the Filter characteristic, or qual-

ity. For lowpass filters, raising the filter Res value will emphasize the frequen-

cies around the set filter frequency. This produces a generally thinner sound,

but with a sharper, more pronounced filter frequency “sweep”. The higher the

filter Res value, the more resonant the sound becomes until it produces a

whistling or ringing sound. If you set a high value for the Res parameter and

then vary the filter frequency, this will produce a very distinct sweep, with the

ringing sound being very evident at certain frequencies.

• For the highpass filter, the Res parameter operates just like for the

lowpass filters.

• When you use the Bandpass or Notch filter, the Resonance setting

adjusts the width of the band. When you raise the Resonance, the

band where frequencies are let through (Bandpass), or cut (Notch)

will become narrower. Generally, the Notch filter produces more

musical results using low resonance settings.

Filter Keyboard Track (Kbd)

If Filter Keyboard Track is activated, the filter frequency will increase the fur-

ther up on the keyboard you play. If a lowpass filter frequency is constant (a

Kbd setting of “0”) this can introduce a certain loss of “sparkle” in a sound the

higher up the keyboard you play, because the harmonics in the sound are

progressively being cut. By using a degree of Filter Keyboard Tracking, this

can be compensated for.

Filter 2

A very useful and unusual feature of the Subtractor Synthesizer is the pres-

ence of an additional 12dB/Oct lowpass filter. Using two filters together can

produce many interesting filter characteristics, that would be impossible to

create using a single filter, for example formant effects.

The parameters are identical to Filter 1, except in that the filter type is fixed,

and it does not have filter keyboard tracking.

➜ To activate Filter 2, click the button at the top of the Filter 2 section.

Filter 1 and Filter 2 are connected in parallel. This means that the output

of Filter 1 is routed to Filter 2, but both filters function independently. For

example, if Filter 1 was filtering out most of the frequencies, this would

leave Filter 2 very little to “work with”. Similarly, if Filter 2 had a filter fre-

quency setting of “0”, all frequencies would be filtered out regardless of

the settings of Filter 1.

✪ Try the “Singing Synth” patch (in the Monosynth category of the

Factory Sound Bank) for an example how dual filters can be used.

Filter Link

When Link (and Filter 2) is activated, the Filter 1 frequency controls the fre-

quency offset of Filter 2. That is, if you have set different filter frequency val-

ues for Filter 1 and 2, changing the Filter 1 frequency will also change the

frequency for Filter 2, but keeping the relative offset.

✪ Try the “Fozzy Fonk” patch (in the Polysynth category of the Fac-

tory Sound Bank) for an example how linked filters can be used.

! Caution! If no filter modulation is used, and the filters are linked,

pulling down the frequency of Filter 2 to zero will cause both filters

to be set to the same frequency. If combined with high Res settings,

this can produce very loud volume levels that cause distortion!

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