4075 LOW-PASS 36B Filter is a faithful recreation of the 24db low-pass filter found in
late model Arp Odysseys.
The filter topology is almost identical to the Arp 4072
filter module found in later editions of the ARP 2600
two mp3s are examples of
the 4075 as a self oscillating sine wave generator
being modulated by the Sequencer 17a and a variety
of LFOs,ADSRs and Oscillators.
An onboard mixer sums the three inputs together and the level control knob sets the overall input level to the filter.
Moderate gain settings provide the smoothest sound but higher gain settings are better for high resonance sounds.
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 Input 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 Input 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.
This knob varies the height of the resonant peak at the cutoff frequency of the filter.
Wide-range lowpass filter with variable-height
resonant peak at cutoff frequency.
4 pole response
24db/oct cutoff slope
Range:Continuously variable from 16Hz-18kHz
Input impedance: 100K ohms
Output impedance: 1k ohms
Control Sens: 1 volt per octave