Kurzweil K2600 Musician's Manual page 447

Advanced KDFX
Effects Buses
Allocation
Understanding PAU allocation and how it works is very important for using KDFX to its fullest
potential.
What's a PAU?
The basic unit of signal processing in KDFX is the Processing Allocation Unit, or PAU. There are
a total of 4 PAUs that can be split among the four insert FXBuses, and another 3 PAUs for the
Aux bus. These two sets of PAUs are distinct and are not interchangeable.
The number of PAUs on an FXBus is determined by the algorithm inside its FX preset. Different
algorithms require different numbers of PAUs, as shown in the Size parameter at the top of the
screen when you are on the FXBus edit page:
EditStudio:FXBUS|Size:2
or inside an FX preset:
EditFXPreset:PARAM1|||EffectSize:2/1
A simple delay, ßanger, compressor, exciter, or small reverb uses only 1 PAU. A complex phaser,
pitcher, or multiband tone control uses 2 PAUs. A really complicated reverb or graphic equalizer
may use 3 PAUs. Only a handful of really wild algorithms use 4 PAUs.
The Allocation parameter on each FXBUS page determines how many PAUs are available for the
FX preset assigned to that bus. If the parameter is set to 1, then only FX presets that use
algorithms requiring 1 PAU will be available for the bus. If you try to assign an FX preset that
requires more PAUs, its name will show up in parentheses, and the sound will pass through the
bus unprocessed.
If you know you want a certain FX preset in a particular FXBus, you can select it, and then set
the Allocation parameter for that bus to match the PAU requirements of the FX preset.
A PAU is a Terrible Thing to Waste
Be careful not to set the Allocation parameter too high. If you set it on some bus to 3, for
example, and you are using an FX preset on that bus that requires only 1 PAU, the other 2 PAUs
are being wasted, since they are not available to be assigned to other buses. The other busesÕ
Allocation parameters will not go higher than 1, and therefore no FX presets whose Size is
greater than 1 can be selected for any of them.
PAUs are normally allocated on a Þrst-come, Þrst-served basis. If you set one FXBus to a PAU of
3, then you will be able to set the Allocation on the next bus you set to 0 or 1 only. If you then set
that second bus to 1, then you wonÕt be able to set a value greater than 0 for any of the other
buses.
If you know that you wonÕt be using an FXBus, or that youÕll be using it only as a ÒdummyÓ to
route signals somewhere else, you can set its Allocation to 0.
Auto Allocation
On any of the buses, you can set Allocation to Auto. Auto means that the PAU allocation for that
bus will automatically adjust itself to the currently selected FX preset. However, Auto obviously
cannot create PAUs when they are in use elsewhere, and Allocations that have been manually
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