instruo/aradh
àradh
Transistor ladder lowpass filter with integrated VCA (pre/post-filter routing), envelope follower, comparator gate output, strike input with variable decay, and user-definable CV parameter assignments. Self-oscillating resonance with auto-gain compensation.470
Capabilities 6
- Comparatorcomparator
- Comparator threshold set via Bias knob hold-gesture. Gate output range 0V to +5V.470
- Envelope Followerenvelope-follower
- Envelope follower derived from pre- or post-filter signal (configurable). Attack time set via Q knob hold-gesture; decay time via Decay Knob. Output range ≈0V to +8V.470
- Lowpass Filterlowpass-filter
- 470
- Transistor Laddertransistor-ladder
- 470
- Vcfvcf
- 470
- Voltage-Controlled Amplifiervca
- Integrated VCA with configurable pre- or post-filter routing via panel switch; unity gain at centre Bias Knob with no CV, or at ~3.6V CV with attenuverter fully clockwise.470
Jacks 6 — 4 in / 2 out
| Name | Signal | Voltage | Description |
|---|---|---|---|
| Inputs (4) | |||
| 1V/Oct Input | cv | — | Bipolar 1V/oct CV input for keyboard tracking; sums with the Filter Cutoff Knob to set cutoff frequency.470 |
| CV Input | cv | — | Bipolar CV input routed to user-assigned parameter(s): VCA amplitude, filter cutoff, resonance, and/or impulse decay. Scaled by CV Attenuverter. Normalled to envelope follower or gate signal when no patch cable present.470 |
| In | audio | — | AC coupled audio input to the lowpass filter and VCA.470 |
| Strike Input | gate | — | Gate/trigger input for the impulse envelope; rising edges trigger a decay envelope modulating filter cutoff and VCA amplitude. Can be triggered at audio rate.470 |
| Outputs (2) | |||
| Gate/Follow Output | mixed | — | Outputs either the comparator gate signal or envelope follower signal depending on the Gate/Follow Toggle position. Envelope follower range ≈0V to +8V; comparator gate range 0V to +5V.470 |
| Out | audio | — | AC coupled audio output from the lowpass filter and VCA.470 |
Parameters 9
| Name | Type | Range | Behavior |
|---|---|---|---|
| Bias Knob | knob | — | Sets the VCA level. Unity gain is achieved at centre position with no CV. Also sets the comparator threshold voltage via hold-gesture.470 |
| CV Assign Button | button | — | Press to cycle through primary user-defined parameter targets (unlit=none, white=VCA amplitude, amber=filter cutoff, white/amber=both). Hold + Strike Button for secondary parameter assignment and other functions. Setting is retained between power cycles.470 |
| CV Attenuverter | knob | — | Scales and inverts the CV Input signal. CW increases modulation depth; CCW increases modulation with inverted polarity; centre fully attenuates. Unity gain of VCA is achieved when fully CW with ~3.6V at CV Input.470 |
| Decay Knob | knob | — | Controls decay time of the impulse envelope; CCW decreases decay, CW increases decay. Also sets decay time of the envelope follower.470 |
| Filter Cutoff Knob | knob | — | Controls the cutoff frequency of the lowpass filter; CW increases, CCW decreases. When self-oscillating, controls the oscillator frequency. Sums with 1V/Oct CV input.470 |
| Gate/Follow Toggle | switch | — | 470 |
| Pre/Post Switch | switch | — | Upward position: VCA post-filter (east-coast routing). Downward position: VCA pre-filter (allows filter saturation). Also determines whether the envelope follower taps the pre- or post-filter signal.470 |
| Resonance Knob | knob | — | Sets filter resonance/Q; fully CW produces self-oscillation generating a sine wave. Auto-gain compensation maintains consistent output level as resonance increases. Also sets attack time of envelope follower via hold-gesture.470 |
| Strike Button | button | — | Manually triggers the impulse envelope. Also used in combination with CV Assign Button for secondary parameter assignment, envelope follower configuration, and factory reset.470 |
Firmware history 0 versions
No firmware history recorded.
References 2
- [470]
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[471]
Instruō àradh product pageproduct_page⚠ verified 2026-05-17 · manufacturer changed since last verified