Sub-Oscillator Outline Sub-Oscillator Outline Outline

Description

The Sub-Oscillator features three linked oscillators with configurable waveforms. The main oscillator tracks the V/OCT input, while the two sub-oscillators synthesize subharmonics of the base waveform. Subharmonics are produced by dividing the base frequency by an integer value. By carefully tuning the two sub-oscillators, you can create moving chords and underlying bass melodies.

Parameters

  • FREQUENCY Knob

    This knob controls the initial pitch at 0V. It ranges from C0 (16.35 Hz) to C8 (4186 Hz), slightly wider than the range on a standard 88-key piano. The default value of 261.63 Hz corresponds to Middle C.

  • WAVEFORM Switch

    This switch configures the waveform generated by each oscillator. See the chart at the end of this section for more information.

  • DETUNE Knob

    This knob slightly detunes each subharmonic oscillator in relation to the base frequency, by up to 2 Hz. A positive detune amount increases SUB 1's frequency and decreases SUB 2's frequency. Negative detune amounts do the reverse.

    Adding a small amount of detune creates appealing chorus and phasing effects, and is recommended when using the SUB 1 MOD waveform.

  • SUB [N] Knobs

    These knobs select each subharmonic oscillator's frequency division. At 1, the oscillator generates the same frequency; at 16, the oscillator generates a waveform four octaves lower than the base.

  • PWM Knob

    This knob modifies the pulse width of each square-wave oscillator, from 10% to 90%.

Ports

  • V/OCT Input

    This input accepts a 1-volt/octave control signal and sets the base pitch of all oscillators. The frequency corresponding to 0V is set using the FREQUENCY knob.

    V/OCT INPUT: -5V to +5V

  • SUB [N] Inputs

    Control voltage here modulates the selected subharmonic for each subharmonic oscillator. The value of these inputs are summed with the SUB [N] knobs before use; the knobs should be set at 50% to modulate over the full control range.

    CV INPUT: -5V to +5V

  • PWM Input

    Control voltage here modulates the pulse width of all three square-wave oscillators. The value of this input is summed with the PWM knob before use; the knob should be set at 50% to modulate over the full control range.

    CV INPUT: -5V to +5V

    Note: Pulse width of 10% to 90% is possible

  • BASE Output

    The output of the main oscillator. See the chart below for information on how the WAVEFORM switch affects the waveform. AC-coupled.

    AUDIO OUTPUT: -5V to +5V

  • SUB [N] Outputs

    The outputs of each subharmonic oscillator. See the chart below for information on how the WAVEFORM switch affects the waveform. AC-coupled.

    AUDIO OUTPUT: -5V to +5V

Waveform Selection

WAVEFORM BASE SUB 1 SUB 2
SAW Saw Saw Saw
SUB 1 MOD Square (PWM + SUB 1) Saw Saw
SQUARE Square (PWM) Square (PWM) Square (PWM)

Signal Flow Diagram

Sub-Oscillator Diagram Sub-Oscillator Diagram