pittsburgh-modular/lifeforms-dynamic-impulse-filter
Lifeforms Dynamic Impulse Filter
All-analog variable response lowpass gate with resonant lowpass filter, VCA, and lowpass gate modes. Uses a Sallen-Key topology for a smooth two-pole filter that self-oscillates at high resonance. Features a tunable dynamics response circuit that replaces the traditional vactrol with a modern analog design.417
Capabilities 4
- Lowpass Filterlowpass-filter
- Dedicated filter mode: Dynamics knob sweeps center frequency, Resonance knob controls resonance amount.417
- Lowpass Gatelowpass-gate
- Lopass gate mode manages both timbre and loudness simultaneously using a modern analog circuit replacing the traditional vactrol.417
- Vcfvcf
- Resonant 2-pole Sallen-Key lowpass filter; self-oscillates at high resonance settings.417
- Voltage-Controlled Amplifiervca
- VCA mode provides high quality voltage-controlled amplification; Dynamics knob controls signal level.417
Jacks 5 (3 in / 2 out)
| Name | Signal | Voltage | Description |
|---|---|---|---|
| Inputs (3) | |||
| Dynamics CV In | cv | — | CV input used to modulate the dynamics amount.417 |
| Impulse Gate In | gate | — | Gate or trigger input used to strike the dynamic impulse circuit and quickly modulate the dynamics of the audio signal.417 |
| Input | audio | — | Audio signal input.417 |
| Outputs (2) | |||
| Out | audio | — | Audio signal output.417 |
| Response Out | cv | — | Dynamics response CV output, optimized to control the vactrol response of modules utilizing vactrols. Responds like a gate when used with non-vactrol modules.417 |
Parameters 5
| Name | Type | Range | Behavior |
|---|---|---|---|
| Dynamics | knob | — | Per-mode control: in filter mode controls center frequency; in VCA mode controls signal level; in lopass gate mode controls both center frequency and signal level.417 |
| Dynamics CV | knob | — | Attenuates the incoming dynamics CV signal.417 |
| Dynamics Response | knob | — | Sets the decay time related to the impulse gate input and dynamic CV input.417 |
| Filter Mode Resonance | knob | — | Controls the amount of resonance. Only active in filter mode; the filter self-oscillates at high resonance settings.417 |
| Mode Switch | switch | — | 3-position switch: up = VCA mode, center = lopass gate mode, down = lowpass filter mode.417 |
Firmware history 0 versions
No firmware history recorded.
References 1
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[417]
Pittsburgh Modular Lifeforms Dynamic Impulse Filter product pageproduct_page● verified 2026-05-16