The Heisenberg’s filter block consists of one to four bi-quad resonant filters connected in series whose frequency responses are determined by their coefficients. The filter section provides controls to set its cutoff frequency, resonance, order and keyboard tracking.

Heisenberg filter section
Figure 7.9.5: The Heisenberg's filter section.

  1. Cutoff/Resonance: This 2D slider sets the cutoff frequency and the amount of resonance of the filter simultaneously. You can set the cutoff frequency as a percentage of a range going from 20 Hz at minimum to 20 KHz at maximum. The resonance goes from none at minimum to full at maximum. Note: Due to the filter’s design, increasing the resonance also reduces the amplitude of the passband up to approximately 10 dB at maximum resonance.
  2. Filter mix: This slider sets the frequency response of the filter as a percentage from low-pass at minimum through bypass at center to high-pass at maximum. It does this by setting the coefficients of all bi-quad filters.
  3. Order: This selector sets the filter roll-off to either 12, 24, 36 or 48 dB per octave. It does this by serially cascading an additional bi-quad filter for each successive order.
  4. Keyboard track: This slider sets the amount by which the pitch of incoming notes modulates the cutoff frequency of the filter from approximately 33% of the filter’s frequency range per octave below the cutoff at minimum through no modulation at center to 33% of the filter’s frequency range per octave above the cutoff at maximum. Note: A C4 note produces no modulation and is the reference pitch from which the modulation produced by other notes is measured.


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