Frap Tools Cunsa
Quadruple multimode resonant filter with saturation and ping
42 HP Eurorack module
CUNSA is a quadruple mono or double stereo pingable multimode resonant filter with custom saturation, feedback control, and analog mixing capabilities. Each of its four independent 12 dB/oct state-variable filters provides simultaneous lowpass, bandpass, and highpass outputs, with the lowpass selectable between 12 and 24 dB/oct slopes. Filters can operate independently or be linked through semi-normalled connections and group outputs for stereo or quad processing. The Character circuit adds musically useful saturation ranging from warm soft clipping to aggressive distortion, while the Ping circuit enables vactrol-like LPG behavior and percussive tones. With V/oct tracking, CUNSA can also function as a quadruple sine wave oscillator.
Features
- Four independent 12 dB/oct state-variable filters
- Simultaneous lowpass, bandpass, and highpass outputs per filter
- Selectable 12 or 24 dB/oct lowpass slope (per filter pair)
- Custom Character saturation circuit per filter
- Q circuit with bass-preserving resonance design
- Self-oscillation for use as quadruple sine oscillator
- V/oct tracking over 4+ octaves (+/-5 cent accuracy)
- Ping circuit with nonlinear slew limiter for vactrol/LPG behavior
- Filter and Combo behavior modes (per filter pair)
- Semi-normalled audio, VCA CV, V/oct, and Ping inputs
- Four group outputs: Dry, 1+2, 3+4, All
- Per-filter output level control for group mixing
Controls & Jacks (60)
- 1+2 Output
- 3+4 Output
- All Output
- Audio Input 1
- Audio Input 2
- Audio Input 3
- Audio Input 4
- BP Output 1
- BP Output 2
- BP Output 3
- BP Output 4
- Behavior Switch 1-2
- Behavior Switch 3-4
- Character 1
- Character 2
- Character 3
- Character 4
- Character CV Input 1
- Character CV Input 2
- Character CV Input 3
- Character CV Input 4
- Coarse Frequency 1
- Coarse Frequency 2
- Coarse Frequency 3
- Coarse Frequency 4
- Dry Output
- Filter LED
- Filter LED 1-2
- Filter LED 2-3
- Filter LED 3-4
- Fine Frequency 1
- Fine Frequency 2
- Fine Frequency 3
- Fine Frequency 4
- Freq CV Attenuverter 1
- Freq CV Attenuverter 2
- Freq CV Attenuverter 3
- Freq CV Attenuverter 4
- Freq CV Input 1
- Freq CV Input 2
- Freq CV Input 3
- Freq CV Input 4
- HP Output 1
- HP Output 2
- HP Output 3
- HP Output 4
- Input Gain 1
- Input Gain 2
- Input Gain 3
- Input Gain 4
- Input LED
- LP Output 1
- LP Output 2
- LP Output 3
- LP Output 4
- Output LED 1
- Output LED 2
- Output LED 3
- Output Level 1
- Output Level 2
How-To Guides
- Basic Filter Sweep
- Stereo Filter Processing
- Vactrol-Style LPG Plucks
- Quadruple Sine Oscillator
- Parallel Multimode Mixing
- Resonant Ringing Percussion
Explore the interactive Cunsa panel on BleepDex — tap any control to learn what it does.
