Appendix
209
Iridium Manual
Coffee Filter
A coffee filter is a coffee-brewing utensil, usually made of
disposable paper. It is part of an essential toolkit for survi-
val when working with the Waldorf Iridium.
Control Change (Controllers)
MIDI messages enable you to manipulate the response of a
sound generator to a significant degree.
This message essentially consists of two components:
• The Controller number, which defines the element to be
influenced. It can be between 0 and 120.
• The Controller value, which determines the extent of the
modification.
Controllers can be used for effects such as slowly swelling
vibrato, changing the stereo panorama position and in-
fluencing filter frequency.
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 compo-
nent within a given time frame so that the sound is chan-
ged in some manner. For instance, an envelope that modu-
lates 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 pro-
grammed 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 fre-
quencies to pass through it and dampens other frequenci-
es. The most important aspect of a filter is the filter cutoff
frequency. The most common type is the lowpass filter. A
lowpass filter dampens all frequencies above the cutoff
frequency.
Summary of Contents for IRIDIUM
Page 1: ...User Manual...
