FXAlg #905: EQ Morpher ¥ FXAlg #906: Mono EQ Morpher
Algorithm Reference-124
Frequency response of (i) a single bandpass filter, and (ii) the sum of two bandpass filters
Now that weÕve gone through what the algorithm does, the question becomes ÒWhy are we doing this?Ó 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, itÕs a good idea not to let the frequencies of the
filters cross each other during the morphing. You can ensure this doesnÕt 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
*EQ Morpher only, not Mono EQ Morpher.
PAGE 2
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*
-100 to 100%
AFreqScale
-8600 to 8600 ct
BFreqScale
-8600 to 8600 ct
A Freq 1
16 to 25088 Hz
B Freq 1
16 to 25088 Hz
A Width 1
0.010 to 5.000 oct
B Width 1
0.010 to 5.000 oct
A Gain 1
-79.0 to 24.0 dB
B Gain 1
-79.0 to 24.0 dB
A Freq 2
16 to 25088 Hz
B Freq 2
16 to 25088 Hz
A Width 2
0.010 to 5.000 oct
B Width 2
0.010 to 5.000 oct
A Gain 2
-79.0 to 24.0 dB
B Gain 2
-79.0 to 24.0 dB
(i)
(ii)
Freq
A
m
p
0 dB
-10
-20
-30
0 dB
-10
-20
-30
Freq
Bandwidth
