Kurzweil K2661 Musician's Manual page 460

Advanced KDFX
Effects Buses
set take precedence over Auto Allocations. So for example, if you set the Allocation of FXBus1
to 3, and set the Allocation of FXBus2 to Auto, the maximum number of PAUs available to
FXBus 2 is still only 1, and if you try to load a Size-2 FX preset into FXBus2, it won't work and
the FX preset's name will show up in parentheses.
If all buses' Allocations are set to Auto, then PAUs are not allocated first-come, first-served, but
instead are allocated in numerical bus order: if an FX preset requiring 3 PAUs is loaded into
FXBus1, then only 1 PAU will be available for the other buses, regardless of which FX preset got
assigned to which bus first.
A parameter called Free appears at the top of every FXBUS page, telling you how many PAUs in
the current studio are unallocated and available.
Effect Size
While you're editing an FX preset and selecting algorithms for it, the EffectSize parameter at the
upper right of the EditFXPreset page informs you of the PAU situation. The first digit in this
parameter's value is the number of PAUs the currently selected algorithm requires, and the
second digit is the number that have been allocated to the bus, either manually or automatically.
If the first digit is larger than the second, the algorithm is not available, and if you choose it, its
name will show up in parentheses and the sound will pass through unprocessed—just like an
unavailable FX preset on an FXBUS page.
If the FXBus's Allocation is Auto, when you change the algorithm inside the FXPreset Editor,
both digits of the EffectSize display will change. If you call up an algorithm that requires more
PAUs than are currently available, the second digit will change to 0—since the algorithm can't
be loaded, the PAUs are freed up for use elsewhere.
Designing with PAUs
One simple way to use Allocations when designing a KDFX studio is to put all of the buses in
Auto, and start with your most complex processing on FXBus 1, then assign other FX presets to
the other buses as they are available.
PAUs on the Aux Bus
The Aux bus is a whole separate processor with 3 of its own PAUs. Allocation is not an issue
with the Aux bus, since its 3 PAUs are assigned to it permanently. (There is a fourth PAU in the
Aux bus, but it is used for mixing and routing, and so it's not available.)
Any FX preset with a PAU requirement of 1, 2, or 3 can be used. When editing the Aux bus,
there's no need for an Allocation parameter or a Free parameter. However, when you are
scrolling through algorithms, the EffectSize parameter will be displayed, with its second digit
always 3. Should you try to access an algorithm on the Aux bus that requires 4 PAUs, the name
of that algorithm will be displayed in parentheses.
The Aux bus is generally used as a global processor, but it doesn't have to be. You can set up one
FXBus as a "dummy"—set its FX preset parameter to 0 None—and send its output to the
Aux bus, and at the same time turn off the Aux sends from all the other buses. Now the Aux bus
can function as an insert FXBus, with 3 PAUs all its own. So if you run into trouble with PAUs on
the insert FXBuses and can sacrifice a global effect, this is one solution.
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