Kurzweil KDFX, Manual

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Real-time Control of KDFX
Preventing glitches when changing Studios
4-15
Figure 4-1. Transition between different FX Presets with the same and different Algorithms
Changing PAU Allocations
There are other circumstances under which using the same Algorithm will not ensure a smooth
transition. If for any reason the PAUs have to be re-allocated when you move from one Studio
to another, then even if the Algorithms on a given FX Bus are the same in both Studios, there
will be a ramp-down/ramp-up. This can happen when there is a change in the
number of PAUs
being used in any FX Bus that has a lower number than the FX Bus you want to have a smooth
transition. ThatÕs because re-allocating PAUs on the ßy forces some of the processors to re-
conÞgure themselves, inasmuch as they are now being called upon to do different functions.
HereÕs an example: say Studio 300Õs FX1 Bus uses a Flanger that requires 2 PAUs, while the FX2
Bus has a small reverb that uses 1 PAU. In Studio 301, the FX1 Bus has a Chorus that uses only
1 PAU, while FX2 uses the same small reverb as Studio 300. When you switch from Studio 300
to Studio 301, one of the PAUs that was previously being used for FX1 is now being used for
FX2ÑitÕs been re-allocated. Since itÕs not the
same PAU thatÕs handling the reverb, the transition
isnÕt going to be smoothÑeven though the Algorithm hasnÕt changed.
There are a couple of ways around this. First is to set up your studios so that any transitions
between them that are going to force changes in PAU allocations occur in the
higher-numbered
FX BusesÑif the situation just described were reversed, and the reverb was in FX1, there would
be no problem, because that same PAU would be used in FX1 in both Studios. A second method
is to
manually allocate the PAUs in the lower-numbered FX Buses, rather than using Auto
allocation. Using the same example, if Studio Y had 2 PAUs hard-assigned to FX1, even though
the FX Preset is only using one of the PAUs, then that second PAU would not get reassigned to
the reverb, and the reverbÕs transition would be smooth.
FX1 10 Slo String Hall
Algorithm:5 MiniVerb
FX1 11 Orch Hall
Algorithm:5 MiniVerb
Studio: Test X
Studio: Test Y
Program 1 Program 2
if algorithm is the same, transition between FX Presets is smooth
FX1 10 Slo String Hall
Algorithm:5 MiniVerb
FX1 4 Recital Hall
Algorithm:1 Panaural Room
Studio: Test X
Studio: Test Y
Program 1 Program 2
if algorithm is different, FX Preset output ramps down, then back up