4.6.1.3. Series / Para
The Series / Para knob is located in the Ladder filter module, but it affects both filters. It
achieves the desired balance between running the filters in parallel or in series, where the
output of VCF 1 is fed into VCF 2. This is better than "the best of both worlds": this is a blending
of two worlds to make the world you want.
In case these terms are unfamiliar, here are two examples of what this means:
• Filters in series use each other's strengths. VCF 1 can cut the lows with its 2-pole
HP mode, and then VCF 2 can roll off the highs with its 4-pole LP curve. The result
is like one filter with two different slopes. The whole is greater than the sum of
the parts, as they say.
• Parallel mode allows stereo synthesis, where the left and right channels can
have different evolving sounds. This is an ideal feature to combine with the
morphing features of PolyBrute.
Here's a simple diagram of the relationship between the filters.
4.6.2. VCF 1 (Steiner)
VCF 1 is an enhanced version of the Steiner filter that featured prominently in the Brute
series synthesizers. Whereas the earlier versions allowed the selection of one filter mode at
a time (lowpass, highpass, bandpass or notch), this one is continuously variable between
those four modes. So a mix of highpass and bandpass is possible, for example.
The Filter mode knob blends seamlessly between these curves:
•
LP
(Lowpass) allows low frequencies to pass while high frequencies are
attenuated.
•
Notch
isn't written on the front panel, but it resides halfway between LP and HP.
A Notch filter carves out a middle band of frequencies between its dual cutoff
points.
•
HP
allows high frequencies to pass while low frequencies are attenuated.
•
BP
(Bandpass) is the opposite of a Notch filter: it allows a band of frequencies
to pass while tapering off the harmonic content on either side of its dual cutoff
points.
The PolyBrute filter modules
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Arturia - User Manual PolyBrute - Voice Architecture
Summary of Contents for PolyBrute
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