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7.1.1. Low Pass Filter
A Low Pass Filter removes frequencies from a sound source. It is the primary component in
subtractive synthesis and widely used in every contemporary music style. What gives the
Low Pass Filter its unique qualities is that it focuses on the harmonics around a cutoff point.
Modulating the cutoff frequency of a filter varies the timbre of sound over time. It can be
considered to be a sophisticated equalizer that selectively reduces the high frequencies of a
sound.
Note:
For the technically inclined: the MicroFreak filter has a 12dB roll-off. This means that it
is somewhat less obtrusive than its 24dB cousin, which has a much steeper slope. The 12dB
filter will do more justice to the oscillators of the MicroFreak, which have rich and complex
harmonics (grains, wavetables/shapers, FM, etc.)
7.1.2. Band Pass Filter
The Band Pass Filter is like a narrow beam that allow only a small range of frequencies to
pass through the Filter. With the resonance knob you set the width of the frequency range
that is allowed to pass through. With the resonance knob completely counter-clockwise
all frequencies are allowed to pass through. Turn it slowly to the right and the range of
frequencies allowed to pass will become smaller. In the clockwise position the filter will start
to self oscillate, and can be used as a sine wave oscillator. In that position it will block all
sound from the Digital Oscillator.
7.1.3. High Pass Filter
The High Pass Filter works in the opposite way of the Low Pass Filter. It removes frequencies
below the cutoff point. When you raise the cutoff frequency the low frequencies will start to
disappear; frequencies that lie below the cutoff frequency will be attenuated. Raise it further
and the midrange will disappear, leaving only the highest harmonics of the Digital Oscillator.
The High Pass Filter is somehow less popular than its cousin, the Low Pass Filter. Maybe this
is because its effect is not as notable or spectacular as that of the Low Pass Filter, and yet it
can be used to great effect for accenting certain beats in an arpeggio or a bass loop.
A popular application of the High Pass Filter is to clean up the sound in a mix. Say you've
programmed a solo sound on your MicroFreak and while mixing it with a bass sound from
another synth you notice that the low end of your sound interferes with the bass. You could
then use the High Pass Filter to remove some low end from your solo sound to make it stand
out in the mix.
Let's have a look at the controls that are at your disposal:
• Cutoff frequency
• Resonance
Arturia - User Manual MicroFreak - The filter: sound in close-up
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