User Manual

4.3.3. VCO 1
VCO 1 has two controls that VCO 2 does not:
4.3.3.1. Metalizer
What is wavefolding? Imagine the peak of a triangle folding over in the middle: now
two sharp peaks are visible on either side. Then picture those peaks folding over, and so
on. That's what the Metalizer does to a triangle wave; it becomes more "jagged," which
increases the harmonic content.
But a waveform is bipolar, so actually the top peaks fold downward and the "bottom peaks"
fold upward, as in this image.
4.3.3.2. Sync 2 > 1
Oscillator sync is a popular feature on analog synthesizers. Normally it takes two forms
(hard sync or soft sync), and the two oscillators are either synced or they aren't. But the way
PolyBrute does this is unusual: its oscillator sync is continuously variable from off to hard
sync, progressing through many levels of soft sync on the way.
Increasing the value of Sync 2 > 1 progressively locks the pitch of VCO 1 to VCO 2. At the
maximum setting, turning the VCO 1 Tune knob doesn't change the pitch of VCO 1; instead it
sweeps through a series of synced harmonics.
Arturia - User Manual PolyBrute - Voice Architecture 23