Blue Lantern Modules — Voks Analog Filter
BLM Voks Analog Filter Manual (PDF)
BLM Voks Analog Filter – Cheat Sheet
Type: Analog VCF (Voltage Controlled Filter)
Format: Eurorack (6HP)
Current draw: +13mA, -13mA
MSRP: $103 (blowout), originally $150
Design: Based on classic Polivoks filter, modernized parts with improved sweep.
Panel Overview & Controls
Inputs
| Label |
Type |
Description |
Voltage Range |
IN (LEVEL) |
Audio/CV |
Attenuated audio input via Level knob |
Audio ±5V typical |
CV IN |
CV |
Direct filter cutoff modulation input |
CV 0-5V |
FM (bi-polar CV) |
CV |
Frequency modulation (bi-polar) input, depth controlled |
CV ±5V |
1 IN |
Audio |
Direct, unattenuated audio input |
Audio ±5V typical |
Outputs
| Label |
Type |
Description |
Voltage Range |
LPF |
Audio |
Low Pass Filter output (12dB/oct, amplified) |
Audio ±5V |
BPF |
Audio |
Band Pass Filter output (6dB/oct, amplified) |
Audio ±5V |
Switches & Buttons
| Label / Type |
Function |
Notes |
| 2-way Toggle |
Filter Mode: Normal / Unstable Brite |
Brite: unstable/edgy |
| 2-way Toggle |
Limiter Diode in circuit: On / Off |
For added saturation |
Knobs
| Knob |
Function |
Range |
| LEVEL |
Controls input gain (attenuates "IN") |
0 → Max input |
| FM Amount |
Controls depth of bi-polar FM |
0 → Max depth (unlabeled, but present) |
Feature Recap
- Modes:
- Normal: Classic Polivoks timbre.
- Unstable Brite: More aggressive/edgy, less predictable resonance.
- Limiter Diode: Soft clipping/saturation switch for character and taming levels.
- Outputs:
- LPF (12dB/oct): Steeper, classic lowpass filter.
- BPF (6dB/oct): Gentler bandpass flavor.
- Inputs:
- Two audio ins:
- One level-controlled via the panel knob.
- One direct, full strength.
- CV Control:
- Direct CV input for cutoff.
- FM input for wild modulations (bipolar).
General Use Tips
- For classic filtering, use
IN with the LEVEL knob, LPF out, switch in Normal/Diode off.
- For wild, unstable tones/noisy sweeps, use Unstable Brite mode and experiment with FM and Limiter engaged.
- Use both LPF and BPF outs for parallel or stereo effects.
- Bi-polar FM accepts full audio-rate CV for aggressive timbres.
Reference Links
BLM Voks Analog Filter Manual (PDF)
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