3.2.2.1. VCO 1 waveform mix
PolyBrute VCOs constantly generate three basic waveforms (sawtooth, triangle, and
square), with two knobs on the bottom row of the VCO module for adjusting the mix
between them. To observe this:
1. Turn the second and third knobs counter-clockwise so they point to the sawtooth
and the sigma (
Σ
), respectively.
2. Hold a note and turn the second knob through its full range: 100% left = sawtooth;
100% right = triangle. A middle position provides a blend of both.
3. For now, leave this knob at 100% right so all you hear is the triangle wave. This
makes it easier to hear what the third knob does.
4. Sigma (
Σ
) is a math symbol that means "the sum of." When the third knob points
there, that means all you hear is the sum of the output from the second knob (i.e.,
the mix between the saw and triangle waves).
5. Turn the third knob gradually to the right. The square wave begins to be heard.
6. When the third knob is 100% right, only the square wave is heard. To prove this,
move the Saw/Triangle wave knob through its full range. You should hear no
change to the sound.
7. Turn the Sigma/Square wave knob to the 12:00 position and move the Saw/
Triangle wave knob to experiment with the blend between all three waveforms.
3.2.2.2. Shape the VCO 1 waveform
Each waveform mix knob has a related shaper/enhancer in the top row. First some
definitions:
•
Metalizer
adds intense harmonics to the triangle waveform through a process
known as
wavefolding.
•
Pulse Width
changes the sound of the square wave from "round" to increasingly
narrow.
Turn the second bottom-row knob to 100% right (triangle), the third knob to 100% left (
Σ
),
and we'll learn about the top-row knobs.
1. Play a note and slowly turn Metalizer from minimum to maximum. The sound
becomes more "edgy."
2. Turn Metalizer down to zero and turn the third bottom-row knob from
Σ
to the
square wave.
3. Turn Pulse Width to 100% left. This is the pure square wave.
4. Play a note and slowly turn Pulse Width from minimum to maximum. The sound
becomes thinner as the pulse width narrows. At 100% right the pulse wave is so
thin it is barely audible.
Now return those four knobs to 100% left (pure sawtooth wave) and let's explore the Steiner
filter.
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Arturia - User Manual PolyBrute - Create a Patch
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