Pole-Zero - Synthesizer WMD - Free user manual and instructions
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| Product type | Eurorack synthesizer module |
| Brand | WMD |
| Model | Pole-Zero |
| Category | Synthesizer module (filter) |
| Module width | 8 HP |
| Module height | 3U (128.5 mm) |
| Module depth | Approx. 30 mm |
| Weight | Approx. 120 g |
| Power supply | Eurorack +12 V and -12 V |
| Current draw | +12 V: 60 mA, -12 V: 55 mA |
| Audio inputs | 1 x 3.5 mm mono jack input |
| Audio output | 1 x 3.5 mm mono jack output |
| Control voltage inputs | Cutoff CV, resonance CV |
| Filter types | Pole-zero based low-pass, high-pass, band-pass |
| Cutoff frequency range | 20 Hz to 20 kHz |
| Controls | Cutoff knob, resonance knob, mode selector |
| Indicators | Power LED |
| Construction | PCB mounted pots and jacks |
| Maintenance | Keep dry, wipe with a soft cloth |
| Safety | Low voltage, suitable for Eurorack cases |
| Spare parts | Standard 3.5 mm jacks, knobs, screws |
| Repairability | Modular design, easily serviceable |
| General information | Designed for patchable synthesizer systems |
| Package contents | Module, power cable, mounting screws |
Frequently Asked Questions - Pole-Zero WMD
What is the WMD Pole-Zero?
The WMD Pole-Zero is a Eurorack synthesizer module that functions as a voltage-controlled filter. It uses a pole-zero topology to provide a range of filter responses including low-pass, high-pass, and band-pass modes.
How do I power this module in a Eurorack case?
Connect the included power cable to your Eurorack case's busboard, ensuring the red stripe aligns with the -12 V rail. The module requires both +12 V and -12 V supplies and draws approximately 60 mA on +12 V and 55 mA on -12 V.
What is the audio signal path through the module?
Audio enters via the 3.5 mm input jack, passes through the filter core, and exits at the output jack. The cutoff and resonance controls shape the signal, and CV inputs allow external modulation of these parameters.
Can I control the cutoff frequency with an external CV?
Yes, the Pole-Zero features a dedicated cutoff CV input. You can patch an LFO, envelope, or sequencer to this input to dynamically alter the filter's cutoff frequency over time.
What is the difference between pole-zero and other filter types?
A pole-zero filter uses a combination of poles and zeros in its transfer function to achieve a steeper or more resonant response. This design allows for flexible mode switching while maintaining a compact module footprint.
How do I clean and maintain the module?
Power off the system before cleaning. Use a dry, soft cloth to wipe the front panel and knobs. Avoid solvents or abrasive cleaners. Keep the module in a dust-free environment to preserve jack and pot integrity.
Is the module reverse-polarity protected?
Yes, the Pole-Zero includes reverse-polarity protection on its power input. However, always double-check the cable orientation before connecting to prevent damage to other modules.
What do the knobs and switches do?
The module features knobs for cutoff frequency and resonance, plus a mode switch to select between low-pass, high-pass, and band-pass responses. CV input attenuators may also be present for fine-tuning modulation depth.
Can I use this module with line-level signals?
Yes, but the module expects modular-level signals (typically 10 V peak-to-peak). Line-level signals (around 1 V) may be quieter, so you might need an external amplifier to bring them up to modular levels.
What is the warranty and repairability?
WMD offers a 2-year limited warranty on this module. The design is serviceable and repairable with standard tools; spare parts such as jacks, knobs, and integrated circuits are available through WMD distributors.
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USER MANUAL Pole-Zero WMD
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Product information
Brand : WMD
Model : Pole-Zero
Category : Synthesizer