Kurzweil KDFX, Manual

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Real-time Control of KDFX
Preventing glitches when changing Studios
4-14
Using KDFX with the internal sequencer.
If you are using the K2500Õs internal sequencer, you have some other options when it comes to
setting up KDFX control. See Chapter 6 for this information.
Preventing glitches when changing Studios
As with any digital effects unit, you need to take some care when you are sending real-time
commands to KDFX which radically alter the nature of the processing it is doing. The trickiest
situations will occur when you are changing Studios, and calling up new FX Presets,
Algorithms, and/or signal routings.
Under the best of circumstances, the transition between two Studios can be seamless, and the
effects in one will ÒmorphÓ into the effects of the other. Under the worst of circumstances, there
will be a momentary ÒholeÓ in the sound, as the effects from the Þrst Studio are cleared out and
the effects of the second Studio build up.
The chances of a smooth transition between Studios will be highest if the Algorithms on the
FXBuses in the two Studios are the same. (In some reverb Algorithms, the
Room Type
parameter should also be the same.) For example, if FX1 in Studio 300 uses an FX Preset based
on the reverb in Algorithm 12, and FX1 in Studio 301 uses a different FX Preset based on the
same reverb Algorithm 12, then when you switch from Studio 300 to Studio 301, the signals
going through FX Bus 1 should experience a smooth reverb change.
However, if the FX1 BusÕs FX Preset in Studio 301 uses a different Algorithm, say the 4-Tap
Delay, Algorithm 131, then at the moment the Studio changes, the reverb effect will ramp down
quickly, there will be a very brief point at which the signal will pass dry, and then the multitap
delay will quickly ramp up. This ramping will take place any time the two Algorithms (or
Room Types) are differentÑeven if on the surface they seem very similar, like a Room and a
Hall.
Even if the Algorithms are the same, however, there is a chance that the transition will not be
completely smooth. Some parameters cause glitches if they are changed in real time even
within a StudioÑdelay lengths, for exampleÑand so if a parameter like that changes when you
switch Studios, the software will clear it out as the Studio changes, and a small hole will appear.
In some cases, instead of a hole, you will hear a momentary pitch shift as the Studio changes. A
bit of experimentation will help you determine how to achieve acceptable transitions between
Studios.