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ESI Operation Manual
Consider, as an example, the human vocal tract, which is a type of
complex filter or resonator. There are dozens of different muscles
controlling the shape of the vocal tract. When speaking, however, we
don't think of the muscles, we just remember how it feels to form the
vowels. A vowel is really a configuration of many muscles, but we
consider it a single object. In changing from one vowel to another, you
don't need to consider the frequencies of the resonant peaks! You
remember the shape of your mouth for each sound and interpolate
between them.
Filter morphing can be controlled by an envelope generator, an LFO,
modulation wheels or pedals, keyboard velocity, key pressure, etc. The
filter Cutoff parameter controls morphing on certain filters. The Q
parameter can control various parameters such as boost/cut and mouth
cavity size and of course, resonance or Q.
ESI Filter Types
2-pole Lowpass
Lowpass filter with 12dB/octave rolloff and Q control.
4-pole Lowpass
Lowpass filter with 24dB/octave rolloff and Q control.
6-pole Lowpass
Lowpass filter with 36dB/octave rolloff and Q control.
2nd Order Highpass
Highpass filter with 12dB/octave rolloff and Q control.
4th Order Highpass
Highpass filter with 24dB/octave rolloff and Q control.
2nd Order Bandpass
Bandpass filter with 6dB/octave rolloff on either side of the passband
and Q control.
4th Order Bandpass
Bandpass filter with 12dB/octave rolloff on either side of the
passband and Q control.
Contrary Bandpass
A novel bandpass filter where the frequency peaks and dips cross
midway in the frequency range.
Swept EQ, 1-octave
Parametric filter with 24 dB of boost or cut and a one octave
bandwidth. Cutoff controls center frequency and Q controls boost or
cut.
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