VCO-A DRIVER & three VCO-B's (X,Y & Z)
Three variations of a legendary oscillator.
One VCO-A DRIVER provides master control functions for any number of VCO-B blocks.
The 'FRQ' output should be connected to the 'FRQ' inputs of all VCO-B blocks.
The 'PHA' output should be connected to the 'PHA' inputs of all VCO-B blocks.
The 'FREQ' control varies the frequency of all associated oscillators over a span of either 2 or 12 octaves, as selected by the SEMITONE-OCTAVE switch.
The SEMITONE-OCTAVE switch selects the range of the 'FREQ' control.
SEMI: -12 to +12 semitones
OCT: -6 to +6 octaves
The WIDTH OF RECTANGULAR WAVE control, sets the ratio of the positive pulse width to the total cycle width, from 5% to 95%.
VCO-B's (X,Y & Z)
VCO-B X: The cleanest version of the three VCO-B's.
VCO-B Y: Soundwise in the middle of VCO-B X and VCO-B Z.
VCO-B Z: The dirtiest version of the three VCO-B's.
The 'FRQ' Input should be connected to the 'FRQ' output of the VCO-A DRIVER block.
The 'PHA' Input should be connected to the 'PHA' output of the VCO-A DRIVER block.
Without, the phase of the rectangular wave is 0, no sound.
All waveforms are available simultaneously at their designated output.
Linear frequency modulation of each individual VCO-B is provided at the A.C. and D.C. inputs. A filter at the A.C. input eliminates any DC offset of the control signal; these two inputs are otherwise identical.
ATTENTION: The FM amount is at its maximum (100%). Use a Volume/Attenuator block infront of the AC or DC inputs to lower the amount of frequency modulation.
Phase-lock syncronization of a VCO-B's frequency is provided by applying the reference oscillator signal to the 'Sync' input.