Modcan module 29A CEM Low Pass Filter


  • CV 1 Amt.
  • CV 2 Amt.
  • CV Rez Amt
  • Res
    This knob varies the height of the resonant peak at the cutoff frequency of the filter.
  • Cutoff
  • Gain
    The filter input level is adjusted using the gain control attenuator. Moderate gain settings provide the smoothest sound.
  • Signal (?dB/-12dB)


  • Input
  • Output
  • 1 V/Oct
    Exponential converters track linear voltage input at 1 volt per octave. This input is primarily used for keyboard tracking and pitch control of filter in self-oscillation mode.
  • CV 1
    Control Voltage input with attenuator to control the depth of frequency modulation. When the knob is centered no modulation occurs. Positioning the knob to the left of zero inverts the incoming voltage (negative) and to the right the voltage is non-inverted (positive).
  • CV 2
    Secondary Control Voltage input with attenuator. CV inputs are used to control the filters cutoff point. The most common input signal would be from an envelope generator or LFO.
  • CV Rez
    CV input to control the resonance amount with an attenuator to control depth of modulation



The CEM Low Pass 29A is a 24dB 4 pole low pass filter based on the CEM 3328 filter IC. Usually we don't offer custom IC designs but in this case the sound was worth it.

One of the main distinguishing capabilities of this filter is the switchable volume compensation for high resonance settings. Most LPF suffer from a 12dB drop in pass band level at high resonance. The CEM 3328 IC has built-in provisions for overriding this limitation. The result is a powerful sound even with high res.

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