Ultramaster KR-106

A synthesizer plugin emulating the Roland Juno-106, built with JUCE.

6-voice polyphonic with per-voice analog variance, TPT ladder filter with OTA saturation, BBD chorus emulation, arpeggiator, portamento/unison mode, and 211 factory presets.

Formats: AU, VST3, LV2, Standalone Platforms: macOS (13+), Windows, Linux

Download latest release

See docs/DSP_ARCHITECTURE.md for a detailed writeup of the signal chain and emulation techniques.

Building

macOS

Requires CMake (3.22+) and Xcode (or Command Line Tools).

git clone --recursive https://github.com/kayrockscreenprinting/ultramaster_kr106.git
cd ultramaster_kr106
make build    # AU, VST3, Standalone
make run      # Build and launch Standalone

Windows

Requires CMake (3.22+) and Visual Studio 2022 (or Build Tools with C++ workload).

git clone --recursive https://github.com/kayrockscreenprinting/ultramaster_kr106.git
cd ultramaster_kr106
cmake -B build
cmake --build build --config Release

Plugins are output to build/KR106_artefacts/Release/.

Linux

Requires CMake (3.22+) and a C++17 compiler.

git clone --recursive https://github.com/kayrockscreenprinting/ultramaster_kr106.git
cd ultramaster_kr106
make deps     # Install ALSA, X11, freetype, etc. (apt)
make build    # VST3, LV2, Standalone

For a release build:

CONFIG=Release make build

Run make help for all available targets.

Project Structure

Source/
  PluginProcessor.cpp/h        Audio processor, parameter setup, preset management
  PluginEditor.cpp/h           Custom GUI layout
  KR106_Presets_JUCE.h         211 factory presets

  Controls/
    KR106Knob.h                Bitmap rotary knob (sprite sheet)
    KR106Slider.h              Pixel-perfect vertical fader
    KR106Switch.h              3-way toggle switch (vertical/horizontal)
    KR106Button.h              Momentary button with LED
    KR106Keyboard.h            On-screen keyboard with transpose
    KR106Scope.h               Oscilloscope with clickable vertical zoom
    KR106Bender.h              Pitch bend lever
    KR106Tooltip.h             Parameter value tooltip overlay

  DSP/
    KR106_DSP.h                Top-level DSP orchestrator, HPF, signal routing
    KR106Voice.h               Per-voice: VCF, ADSR, oscillator mixing, portamento
    KR106Oscillators.h         PolyBLEP saw, pulse, sub, noise generators
    KR106Chorus.h              MN3009 BBD chorus with Hermite interpolation
    KR106LFO.h                 Global triangle LFO with delay envelope
    KR106Arpeggiator.h         Note sequencer (Up / Down / Up-Down)

docs/
  DSP_ARCHITECTURE.md          Detailed DSP design documentation
  HOLD_ARP_FLOW.md             Hold + arpeggiator interaction flow

tools/preset-gen/              Original patch files and conversion utilities

Contributing

See CONTRIBUTING.md for guidelines on submitting issues and pull requests.

License

This project is licensed under the GNU General Public License v3.0. Third-party library licenses are listed in THIRD_PARTY_LICENSES.