KDFX Reference
KDFX Algorithm Specifications
10-159
arranged in parallel and their outputs summed, so the bandpass peaks are added together and the
multiple resonances are audible.
Figure 10-73 Frequency response of (i) a single bandpass filter; (ii) the sum of two bandpass
filters
Now that we’ve gone through what the algorithm does, the question becomes “Why are we doing this?”
With careful thought to parameter settings, EQ Morph does an excellent job of simulating the resonances
of the vocal tract. A buzz or sawtooth signal is a good choice of source material to experiment with the EQ
Morphers. Set the Morph A>B parameter to 0%, and find a combination of A filter settings which give an
interesting vowel like sound. It may help to start from existing ROM presets. Next set Morph A>B to 100%
and set the B parameters to a different vowel-like sound. You can now set up some FXMods on Morph
A>B to morph between the two sets of parameters, perhaps using Freq Scale to make it more expressive.
When morphing from the A parameters to the B parameters, A filter #1 moves to B filter #1, A filter #2
moves to B filter #2, and so on. For the most normal and predictable results, it’s a good idea not to let the
frequencies of the filters cross each other during the morphing. You can ensure this doesn’t happen by
making sure the four filters are arranged in ascending order of frequencies. Descending order is okay too,
provided you choose an order and stick to it.
Parameters
Page 1
In/Out In or Out Out Gain Off, -79.0 to 24.0 dB
Morph A>B 0 to 100% Out Pan -100 to 100%
Out Width
1
1. EQ Morpher only
-100 to 100%
AFreqScale -8600 to 8600 ct BFreqScale -8600 to 8600 ct
(i) (ii)
Freq
A
m
p
0 dB
-10
-20
-30
0 dB
-10
-20
-30
Freq
Bandwidth
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