wmd/c4rbn
C4RBN
4/2-pole state-variable filter with input saturation, output wavefolding, simultaneous 2-pole HP/BP/LP outputs, and a switchable 4-pole output (HP/LP/BP). Includes a ping circuit emulating vactrol response and temperature-compensated V/Oct tracking.295
Visualization filter_response
Capabilities 4
- Input Saturationinput-saturation
- 295
- Self-Oscillationself-oscillation
- Filter self-oscillates when resonance is set above the 3 o'clock position.295
- State-Variable Filterstate-variable-filter
- 4/2-pole SVF with simultaneous 2-pole HP/BP/LP outputs and a switchable 4-pole output (HP/LP/BP). Self-oscillates above 3 o'clock on the RES knob.295
- Wavefolderwavefolder
- Output wavefolder from the classic SYNCHRODYNE, applied to the 4-pole output. Toggled via the FOLD/SAT button.295
Jacks 9 — 5 in / 4 out
| Name | Signal | Voltage | Description |
|---|---|---|---|
| Inputs (5) | |||
| FM | cv | — | Exponential FM CV input for controlling filter cutoff. Scaled by the FM attenuverter knob.295 |
| IN | audio | -10V to 10V | Audio input; passes through the input saturator before entering the first 2-pole filter.295 |
| PING | gate | — | Gate or trigger input that generates a fast decay envelope routed to cutoff, emulating the response of a vactrol for resonant pinged tones.295 |
| SAT | cv | — | Analog CV input for the input saturator; offers greater control over the saturation level.295 |
| V/OCT | cv | — | Calibrated exponential CV input for controlling filter cutoff in the classic keytracking style. Temperature compensated.295 |
| Outputs (4) | |||
| 2P BP | audio | — | 2-pole (12 dB/oct) band-pass output of the first state-variable filter stage. Available simultaneously with the 2P LP and 2P HP outputs — all three are taps off the same SVF core, independent of the HP/BP/LP switch that selects the 4P OUT response.295 |
| 2P HP | audio | — | 2-pole (12 dB/oct) high-pass output of the first state-variable filter stage. Available simultaneously with the 2P LP and 2P BP outputs — all three are taps off the same SVF core, independent of the HP/BP/LP switch that selects the 4P OUT response.295 |
| 2P LP | audio | — | 2-pole (12 dB/oct) low-pass output of the first state-variable filter stage. Available simultaneously with the 2P BP and 2P HP outputs — all three are taps off the same SVF core, independent of the HP/BP/LP switch that selects the 4P OUT response.295 |
| 4P OUT | audio | — | 4-pole output whose response (HP, LP, or BP) is selected via the HP/BP/LP panel button. Output wavefolder can be toggled on this output via the FOLD/SAT button.295 |
Parameters 5
| Name | Type | Range | Behavior |
|---|---|---|---|
| FM | knob | — | Inverting attenuator that scales the FM input jack signal. Exponential response controlling filter cutoff.295 |
| FOLD/SAT | button | — | Press to toggle the 4-pole output wavefolder (FOLD LED indicates enabled state). Hold to cycle through 4 levels of input saturation (SAT LED indicates current level).295 |
| FREQ | knob | 2.5Hz – 10000Hz | Manual filter cutoff frequency control, ranging from 2.5Hz to 10kHz.295 |
| HP/BP/LP | button | — | Cycles through HP, BP, and LP responses for the 4-pole output. LED changes immediately; audio waits until selection is made. Holding the button delays the audio change until release.295 |
| RES | knob | — | Controls filter resonance. Self-oscillates above the 3 o'clock position.295 |
Firmware history 0 versions
No firmware history recorded.
References 2
- [295]
- [296]