Propellerhead Reason - 4.0 Instrukcja Operacji Pobierz pdf (Strona 251)

NN-19 SAMPLER

249

The Filter Section

Filters are used for shaping the overall timbre of the sound. The filter in NN-19 is 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:

D 24 dB Lowpass (LP 24)

Lowpass filters lets low frequencies pass and cuts out the high frequencies. This

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

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

D 12 dB Lowpass (LP 12)

This type of lowpass filter is also widely used in classic analog synthesizers (Ober-

heim, TB-303 etc.). It has a gentler slope (12 dB/Octave), leaving more of the har-

monics in the filtered sound compared to the LP 24 filter.

D Bandpass (BP 12)

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

are not affected. Each slope in this filter type has a 12 dB/Octave roll-off.

D High-Pass (HP12)

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

cies and letting the high frequencies pass. The HP filter slope has a 12 dB/Octave

roll-off.

D Notch

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

pass filter. It cuts off frequencies in a narrow midrange band, letting the frequen-

cies 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 “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 “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 charac-

teristic, or quality. For lowpass filters, raising the filter Res value will emphasize the fre-

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

with a sharper, more pronounced filter frequency “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.

Envelope Section

Envelope generators are used to control several important sound parameters in ana-

log synthesizers, such as pitch, volume, filter frequency etc. Envelopes govern how

these parameters should respond over time - from the moment a note is struck to the

moment it is released.

Standard synthesizer envelope generators have four parameters; Attack, Decay, Sus-

tain and Release (ADSR).

There are two envelope generators in the NN-19, one for volume, and one for the filter

frequency.

! Please refer to the Subtractor chapter for a description of the basic enve-

lope parameters.

Amplitude Envelope

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