The voice section provides controls to set the timbre and tuning of the oscillator, the parameters of the filter and its envelope generator and the relative volume of accented notes.

Bassline voice section
Figure 7.7.1: The Bassline's voice section.

  1. Waveform: This selector sets the shape of the waveform produced by the Bassline’s oscillator. The two choices are a sawtooth wave (ramp down) or a square wave. Note: To preserve sonic authenticity, the actual waveforms resemble their ideal counterparts only approximately.
  2. Tuning: This knobs shifts the pitch of the oscillator in cents, from one octave below the original pitch at minimum through original pitch at center to one octave above original pitch at maximum.
  3. Cutoff frequency: The Bassline provides a resonant low-pass filter with a roll-off of 24 dB per octave. When the current note is not accented or when the “Accent” knob is at zero, this knob sets the cutoff frequency of the filter from approximately 100 Hz at minimum to 1 KHz at maximum.
  4. Resonance: This knob sets the amount of resonance of the Bassline’s filter from no resonance at minimum to full resonance at maximum.
  5. Envelope mode: The cutoff frequency of the Bassline’s filter can be modulated by a simple filter envelope generator. The envelope consists of a straight negative slope. This knob sets the amount of modulation as a percentage of the filter’s frequency range from approximately ten percent at minimum to full at maximum.
  6. Decay: This knob sets the decay time of the filter envelope in milliseconds from approximately 150 milliseconds at minimum to 500 milliseconds at maximum.
  7. Accent: This knob sets the volume of accented notes as a percentage of the volume of unaccented notes from same volume at minimum to approximately twice the volume at maximum. It also raises the filter cutoff frequency from no raise at minimum to a four times raise at maximum.

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