Cosmotronic VPRTEX, Руководство пользователя

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VCO2
VCO2 is also a TRIANGLE core oscillator. The core output is internally shaped to a SQUARE (for syncing
VCO1) and a SINE (for modulating the parameters on VCO1). This shaping happens before the
modulation accessible on the front panel so the settings of the sliders don’t effect these (the FM bus
does though). The flow chart for VCO2 is in the ADDENDUM section to the back of this user manual.
The following sections will only make sense when you listen to the MAIN output of VCO2.
SHAPE
The SHAPE slider controls the waveshaper of VCO2. It continuously shapes the wave from a SINE with
the slider completely down (picture 7) to a TRIANGLE (picture 8) when the slider is in the middle
position and finally an INVERSE SAW (picture 9) with the slider completely up.
When looking at the pictures from the scope you’ll notice that these waveshapes are a little deformed,
this is because of the unique topology of the wavefolder on VCO2 that always adds some distortion,
even with the FOLD slider in the down position. The clean waveshapes are available at the dedicated
SINE output next to the MAIN output as this output bypasses both the WAVEFOLDER and the LOW
PASS FILTER.
It’s possible to modulate the SHAPE parameter using the SINE of VCO1 (normalized). The knob is an
attenuator for this modulation. You can override this normalization by patching a signal into the SHAPE
input. The slider behaves as an offset for any modulation you send into this input. The knob acts as
an attenuator for the external modulation. The SHAPE input accepts bipolar signals and the maximum
range of modulation is achieved (when the SHAPE slider is in the down position) from 0V to 5V.
Just as it was the case for the waveshaper of VCO1 it’s possible to push the waveshape of VCO2
beyond it’s expected behaviour. By sending in - 5V when the SHAPE slider is in the down position the
SINE from the MAIN output is shaped into a ROUNDED SQUARE (picture 10). This also happens when
the normalized modulation (SINE of VCO1) is used. It’s easier to notice if you send in a negative
voltage into the V/OCT input of VCO1 to slow it down into LFO rates.
VORTEX / Complex Oscillator 12
picture 7: sine picture 8: triangle
picture 9: inverse saw picture 10: rounded square