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Product number: CV4376

Bandpass Filter & Distortion

  • +12V 69mA
    -12V 58mA
    +5V 0mA
    Width 8HP
    Depth 42mm


Pandora is a bandpass filter/distortion processor, based on an unusual combination of power MOSFET transistors and vactrols. Voltage control is provided over the two sides of the filter, the gain, and the filter feedback. A wet/dry mixer is provided, also under voltage control.

A range switch is provided to drop the filter response several octaves, at which point the module becomes capable of synthesising percussion sounds when fed trigger pulses.

The module is 100% analogue.

Use as a drum synth:

Setting the switch to Low changes the flter centre frequency range to one more appropriate for drum synthesis, though you are of course free to use it in this position for audio processing as well. All the other controls continue to work exactly as before.

Suggested starting points in this use case are: Alpha 10, Beta 5.5, Gain 5, Feed 3, Mix 10. Hit the module input with a short trigger pulse (around 10ms). This should give you an analogue kick drum sort of sound.

Changing Alpha or Beta will change the resonant frequency (pitch) of the drum. Changing Gain (and/or attenuating the trigger pulse) will afect how much of the trigger makes its way to the output as an initial 'click'. Changing Feedback will afect how long the flter 'rings' for i.e. the release time of the sound.

Experiment with CV control over the various aspects of the flter. In particular, it is worth noting that the classic '808' kick drum is achieved by doubling the pitch of the waveform for the frst cycle, which you can achieve by giving Beta a separate trigger pulse of just the right length and amplitude.

Another suggestion is to apply an envelope to the Feedback input – triggered with the actual drum trigger, or separately.



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