Propellerhead Reason - 1.0.1 Manual de operaciones descargar pdf (Pagina 129)

NN-19 DIGITAL SAMPLER

127

The Filter Section

Filters are used for shaping the overall timbre of the sound. The filter in NN-

19 contains a multimode filter with five filter types.

Filter Mode

With this selector you can set the filter to operate as one of five different

types of filter. These are as follows:

➜ 24 dB Lowpass (LP 24)

Lowpass filters lets low frequencies pass and cuts out the high frequen-

cies. This filter type has a fairly steep roll-off curve (24dB/Octave). Many

classic synthesizers (Minimoog/Prophet 5 etc.) used this filter type.

➜ 12 dB Lowpass (LP 12)

This type of lowpass filter is also widely used in classic analog synthesiz-

ers (Oberheim, TB-303 etc.). It has a gentler slope (12 dB/Octave), leav-

ing more of the harmonics in the filtered sound compared to the LP 24

filter.

➜ Bandpass (BP 12)

A bandpass filter cuts both high and low frequencies, while midrange fre-

quencies are not affected. Each slope in this filter type has a 12 dB/Oc-

tave roll-off.

➜ High-Pass (HP12)

A highpass filter is the opposite of a lowpass filter, cutting out the lower

frequencies and letting the high frequencies pass. The HP filter slope has

a 12 dB/Octave roll-off.

➜ Notch

A notch filter (or band reject filter) could be described as the opposite of a

bandpass filter. It cuts off frequencies in a narrow midrange band, letting

the frequencies below and above through.

Filter 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 “Envelope Section” below) as well. Changing

the Filter Frequency with the Freq slider may therefore not produce

the expected result.

Resonance

The filter resonance parameter (sometimes called Q) 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 fre-

quency “sweep”. The higher the resonance 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.

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Propellerhead Reason - 1.0.1 Manual de operaciones Pagina 129

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Propellerhead Reason - 1.0.1 Manual de operaciones Pagina 129

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