Section 6 — Standard Sound Parameters
24 ENSONIQ KT Musician’s Manual
Editing the Filters
To Set the Filter Mode
1. Press {EDIT_SOUND}.
2. Press the upper {4} button.
3. Press the lower {0} button.
4. Use the Data Entry Slider or the {VALUE} buttons to change the filter mode.
Note that changing the value of one will also change the value of the other.
5. Use the {CURSOR} buttons to switch between filter 1 and filter 2.
To Change the Filter Cutoff Frequency
1. Press {EDIT_SOUND}.
2. Press the upper {4} button.
3. Press the lower {1} button.
4. Use the Data Entry Slider or the {VALUE} buttons to change the filter cutoff frequency.
Note that higher cutoff settings allow fewer low frequencies through.
To Modulate the Filters
1. Press {EDIT_SOUND}.
2. Press the upper {4} button.
3. Press the lower {2} button.
4. Use the Data Entry Slider or the {VALUE} buttons to change the filter modulators.
More About Filters
Low Pass/High Pass Filters
A low pass filter allows only those frequencies below the filter cutoff frequency to pass — higher
frequencies are filtered out. A high pass filter lets frequencies higher than the cutoff frequency
pass and filters out those below. In the KT, Filter 1 is always a low pass filter. Filter 2 can be
either a high pass or low pass filter.
Poles: Rolloff Curves
“Pole” is an engineering term that describes the steepness of a filter, or the filter’s cutoff slope.
Each additional pole gives a filter a steeper rolloff curve. In the KT, the filter modes are
interdependent: that is, the combined number of poles in Filter 1 and Filter 2 is always four.
These four available poles are divided between the two filters; either as 2 and 2, or as 3 and 1. A
1-pole filter will rolloff at 6 dB per octave; a 2-pole filter, at 12 dB per octave; a 3-pole filter, at 18
dB per octave; and a 4-pole filter, at 24 dB per octave. To reproduce a 4-pole low-pass filter (for
that “classic” analog synth sound) you would set both filters to 2-pole low-pass; each filter will
then rolloff at 12 dB per octave, resulting in a total 24 dB per octave rolloff.
Cutoff Frequency
Every filter has a “knee” in its response curve, known as the cutoff frequency. This is the
frequency at which the filter begins filtering out frequencies. The filter cutoff frequency can
remain fixed over time, or it can be varied by modulating the filter with an envelope, LFO,
velocity, etc.
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