20-28 C15 Software Update 2020

The C15 received a major update of the operating system, the Synth Engine and the User Interface. The update includes , and modes, more voices, and more Controls and Targets.

This update continues the constant evolution of the C15 since its launch nearly three years ago. It expands the range and quality of sounds and improves the playability and suitability for musical performance.

The new software is a complete rewrite. Based on the new architecture, future developments will be easier and will also benefit from new opportunities. The Synth Engine and the User Interface now both run on Linux.

The update is free for all C15 users, who will also benefit from the interchangeable magnetic foils, as the new version comes with updated overlays reflecting the new features.

Enhanced Quality and Performance

  • More efficient sound engine: 24 voices (before: 20), two complete effects chains
  • Sample-precise envelope times
  • Enhanced velocity resolution
  • Optimized keyboard latency
  • Improved glitch suppression for preset recalls
  • Support for more types of pedals and footswitches
  • Better linearisation of the Ribbons

Dual Modes

The 24 voices can be split into two (groups of 12 voices for and ), loading different presets. Each Part contains a complete effect section. The voice allocation can run in or Mode.

Mode

and are assigned to different key ranges.

Mode

Voices from and are stacked per key.

The Feedback Mixer now has additional channels to receive signals from the other . This means that in mode the two voices not only can run in parallel but their signal processing can be combined in serial and feedback structures, allowing e.g. 4-operator PM or 8-pole filters.

The mode also offers crossfades that are controlled by the velocity or the key position.

Monophonic Modes

The voice allocation now supports monophonic playing with Lowest, Highest and Last Key priority, four different Legato modes and an adjustable Glide time. (Up to 24 unison voices can be layered.)

Six Macro Controls

The four existing Controls (, , , ) are extended by and . All six Macros are also available in the View, a 2-D control surface for touch screens.

More Modulation Targets

Additional parameters (e.g. the Oscillator Phases) can be assigned to the Controls.

New Parameters

  • Envelope A/B: Velocity amounts for the Decay 1 and Decay 2 times
  • Envelope A/B: Elevate can raise the Breakpoint and Sustain levels for the timbre or the amplitude of an oscillator.
  • Envelope C: Retrigger Hardness can control the starting point of mono voices
  • Oscillator A/B: Reset can be disabled for free-running mode
  • Tremolo effect as an extension of the Flanger
  • Dual mode: Volume and Tune for and
  • Layer mode: Fade From (key), Fade Range
  • Feedback Mixer: more inputs for cross routing in mode
  • Output Mixer: signal split to both Dual mode effect chains
  • Individual smoothing times for the six Controls
  • Setting: Adjustable tuning reference: 440 +/-40 Hz

Extended Parameter Ranges and Resolutions

  • Unison with up to 24 voices (before: 12)
  • Bipolar Level Velocity amounts (for velocity crossfades)
  • Internal high-resolution parameter format