Kurzweil KDFX, Manual

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What is KDFX
KDFX Terms
1-3
FX Algorithm (or just ÒAlgorithmÓ)
A speciÞc type of signal processing, like a hall reverb, plate reverb, chorus, ßanger, pitcher,
compressor, rotary speaker, etc., which is at the core of an
FX Preset . KDFX comes with a large
variety of Algorithms, which are stored in ROM, and are not changeable by the user. Additional
Algorithms, supplied by Kurzweil, can be loaded in from disk when they become available.
Algorithm
Parameters (RT
60
, delay feedback, pitch change, etc.) are changeable by the user, and
those user-controlled parameters are stored in RAM as part of an FX Preset. (DonÕt confuse
these with the VAST Algorithms used inside the K2500 Program Editor.)
Size/PAUs
How big an Algorithm is, in terms of how much processing power it needs to operate. Size is
measured in Processor Allocation Units, or ÒPAUsÓ. Some simple algorithms require only 1
PAU, while more complex ones require 2, 3, or even 4. The total number of PAUs available to
the four
Insert FX Bus es is 4. PAUs can be allocated automatically as FX Presets are assigned to
FX Buses, or manually by the user. The Aux FX Bus has its own set of 3 PAUs, which are not
shared with the Insert FX Buses.
Parameters
Refers to the user-controlled settings for the different characteristics of an Algorithm . For
example, the user can set the reverb time (RT
60
) of an Algorithm to 3.5s, or the feedback of a
delay line to 90%, or the dynamic ratio of a compressor to 10:1. Parameters are stored, along
with the Algorithm they modify, as part of an
FX Preset . In certain cases, the parameter settings
within a Studio can be overridden, either using FXMods or Bus Overrides .
FXMods
FXMods allow the Parameters within a Studio to be controlled in real time from outside the
Studio. Almost any parameter within a Studio can be controlled by MIDI commands, such as
sliders or ribbons or sequencer data, or by internal K2500 functions, such as LFOs, envelopes,
clocks, or key states, by setting up an FXMod between the parameter and the desired control
source. FXMods are not set up in the Studio, but rather in a K2500 Program or Setup that will be
associated with that Studio. These links are created on seven ÒFXÓ editing pages in the K2500Õs
Program or Setup editor. A Program or Setup can contain up to 18 FXMods. In addition,
Programs and Setups now contain two dedicated LFOs, two ASR envelopes, and four
FUNctions just for this purpose. FXMods are stored as part of a Program or Setup, not as part of
a Studio or FX Preset.
Bus Overrides (or BusMods)
Bus Overrides allow Parameters within an FX Preset to be controlled on the FX Bus page in the
Studio Editor, outside the FX Preset editor , but still within the Studio. Any two parameters in
an FX Preset can be brought out to its FXBus page. Bus Overrides are stored as part of the
Studio, not as part of the FX Preset. They are useful when an existing FX Preset is close to what
you want, so that you can tweak it without having to create a new FX Preset. Bus Overrides and
FXMods can both exist in a Studio at the same time.