Propellerhead Reason Specifications download pdf (Page 147)

NN-19 SAMPLER

145

Envelope Section

Envelope generators are used to control several important sound parameters in

analog synthesizers, such as pitch, volume, filter frequency etc. Envelopes gov-

ern 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.

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

envelope parameters.

Amplitude 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 Amplitude En-

velope parameters, Attack, Decay, Sustain and Release. This determines the ba-

sic 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 to control two parameters; filter frequency and

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

quency and/or the sample pitch should change over time with the four Filter En-

velope 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 setting affects how much further the

filter will open.

Filter Envelope Invert

If this button is activated, the envelope will be inverted. For example, normally the

Decay parameter lowers the filter frequency, but after activating Invert it will in-

stead 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. LFOs are oscillators in the sense that

they generate a waveform and a frequency. However, there are two significant

differences compared to normal sound generating oscillators:

• LFOs only generate waveforms with low frequencies.

• The output of the two LFOs 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 gen-

erating) oscillator or sample, to produce vibrato.

The LFO section has the following parameters:

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Propellerhead Reason Specifications Page 147

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