Propellerhead Reason - 4.0 Manual de operaciones descargar pdf (Pagina 195)

SUBTRACTOR SYNTHESIZER

193

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 “opening” 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 Fil-

ter Envelope (see page 194) as well. Changing the Filter Frequency with

the Freq slider may therefore not produce the expected result.

Resonance

The filter resonance parameter is used to set the Filter characteristic, or quality. For

lowpass filters, raising the filter Res value will emphasize the frequencies 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 reso-

nant 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 further 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 presence of an

additional 12dB/Oct lowpass filter. Using two filters together can produce many inter-

esting 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.

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

Filter 1 and Filter 2 are connected in series. 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 frequency 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 of how dual filters can be used.

Filter Link

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

set of Filter 2. That is, if you have set different filter frequency values 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 Factory

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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Propellerhead Reason - 4.0 Manual de operaciones Pagina 195

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