Propellerhead Reason - 1.0.1 Manual de Operações descarregar pdf (Página 130)

NN-19 DIGITAL SAMPLER

128

Envelope Section

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

envelope parameters.

Envelope generators are used to control several important sound parame-

ters in analog synthesizers, such as pitch, volume, filter frequency etc. Enve-

lopes 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, Sustain and Release (ADSR).

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

for the filter frequency.

Amplifier Envelope

The Amp Envelope is used to adjust how the volume of the sound should

change from the time you press a key until the key is released. By setting up

a volume envelope you sculpt the sound’s basic shape with the four Amplifier

Envelope parameters, Attack, Decay, Sustain and Release. This determines

the basic character of the sound (soft, long, short etc.). The Level parameter

acts as a general volume control for the sample patch.

Filter Envelope

The Filter Envelope can be used two control two parameters; filter frequency

and sample pitch. By setting up a filter envelope you control the how the filter

frequency and/or the sample pitch should change over time with the four Fil-

ter Envelope parameters, Attack, Decay, Sustain and Release.

Filter Envelope Amount

This parameter determines to what degree the filter will be affected by the

Filter Envelope. Raising this knob’s value creates more drastic results. The

Envelope Amount parameter and the set filter frequency are related. If the

Filter Freq slider is set to around the middle, this means that the moment you

press a key the filter is already halfway open. The set Filter Envelope will

then open the filter further from this point. The Filter Envelope Amount set-

ting affects how much further the filter will open.

Filter Envelope Invert

If this button is activated, the envelope will be inverted. For example, nor-

mally the Decay parameter lowers the filter frequency, but after activating In-

vert it will instead raise it, by the same amount. Note that Invert does not

affect the Osc pitch parameter (this can be inverted by setting positive or

negative values).

LFO Section

LFO stands for Low Frequency Oscillator. LFO’s are oscillators in the sense

that they generate a waveform and a frequency. However, there are two sig-

nificant differences compared to normal sound generating oscillators:

• LFO’s only generate waveforms with low frequencies.

• The output of the two LFO’s are never actually heard. Instead they

are used for modulating various parameters.

The most typical application of an LFO is to modulate the pitch of a (sound

generating) oscillator or sample, to produce vibrato.

The LFO section has the following parameters:

1 2 ... 125 126 127 128 129 130 131 132 133 134 135 ... 206 207

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