Waldorf Lector - Manual (Page 44)

Appendix
Lector User´s Manual 44
Decay
“Decay” describes the descent rate of an envelope once
the Attack phase has reached its zenith and the envelope
drops to the level defined for the Sustain value.
Envelope
An envelope is used to modulate a sound-shaping
component within a given time frame so that the sound is
changed in some manner. For instance, an envelope that
modulates the cutoff frequency of a filter opens and closes
this filter so that some of the signal's frequencies are
filtered out. An envelope is started via a trigger, usually a
fixed trigger. Normally, the trigger is a MIDI Note. The
classic envelope consists of four individually variable
phases: Attack, Decay, Sustain and Release. This
sequence is called an ADSR envelope. Attack, Decay and
Release are time or slope values, and Sustain is a variable
volume level. Once an incoming trigger is received, the
envelope runs through the Attack and Decay phases until
it reaches the programed Sustain level. This level remains
constant until the trigger is terminated. The envelope then
initiates the Release phase until it reaches the minimum
value.
Filter
A filter is a component that allows some of a signal's
frequencies to pass through it and dampens other
frequencies. The most important aspect of a filter is the
filter cutoff frequency. Filters generally come in four
categories: low pass, high pass, band pass, and band stop.
A low pass filter dampens all frequencies above the cutoff
frequency. A high pass filter in turn dampens the
frequencies below the cutoff. The band pass filter allows
only those frequencies around the cutoff frequency to
pass, all others are dampened. A band stop filter does just
the opposite, i.e. it dampens only the frequencies around
the cutoff frequency. The most common type is the low
pass filter.
LFO
LFO is an acronym for low-frequency oscillator. The LFO
generates a periodic oscillation at a low frequency and
features variable waveshapes. Similar to an envelope, an
LFO can be used to modulate a sound-shaping
component.
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