Dual Mode Signal Flow

Recap: Parameter Organization

As explained in Parameter Organization, the C15 Synthesis Engine is divided into distinct that operate differently according to the current Type:

Section

Global parameters are present once within a Preset of any Type and form the global section, including Sources and their corresponding Amounts, Controls and their corresponding Times as well as the Group (containing Volume, Tune and Scale parameters).
Sections
Voicegroup
(poly)

Parameters bound to polyphonic components (Envelopes A/B/C, Oscillators A/B, Shapers A/B, Comb and State Variable Filters, Feedback and Output Mixers) are present once for Sounds and twice for or Sounds and form one (single) or two (dual) Voicegroups.

In the Feedback Mixer, there are special parameters facilitating polyphonic cross feedback between both (A-B, A-B From I/II, Comb From I/II, SVF From I/II) that are only available in Sounds.
Effects
(mono)		 Parameters bound to monophonic components (Flanger, Cabinet, Gap Filter, Echo, Reverb) also are present once for Sounds and twice for or Sounds and form one (single) or two (dual) effect chains.
Part In or Sounds, each Voicegroup and corresponding effect chain is bound to a Part component with additional Volume and Tune parameters.

Dual Sounds - Main Signal Flow

The shown chart can be described as follows:

  1. The Output Mixer's main stereo signal of a particular Voicegroup is passed to the FX distributor, sending the signal to both Effect sections with different levels (similar to stereo panning of a mono signal).
  2. The Reverb's stereo output signal of a particular effect chain is then passed to the Part component, where the Part Volume is applied.
  3. Both Parts will then be added and passed to the global Master Volume for final gain control.

Layer Sounds - Detailed Signal Flow

With Sounds, the emerging additional details of the shown chart can be described as follows:

  1. The Feedback Mixer of a particular Voicegroup can apply polyphonic self/cross feedback (cross: from the other Voicegroup), allowing signals from the Oscillators A/B as well as the Comb and State Variable Filters to be sent inbetween.
  2. The output of a particular effect chain provides an additional dry and wet signal (being downmixes of the stereo Reverb input and output signals). These signals are then sent back to each Voicegroup's Feedback Mixer for applying monophonic self/cross feedback.