As already said the Aperture consists of a low pass filter and a high pass filter, which being connected in series form a band pass. The cutoff frequencies are moved simultaneously using the 1V/Oct and Freq inputs as well as the Frequency- potentiometer, the passband width (= distance between low- and high-pass' cutoffs) is set with Width.
Cutoff position and passband width are visualized with eight LEDs.
Yet it is possible to control the cutoff frequencies of both filters individually by using the sockets HP CV and LP CV
The input level control is at unity gain in 12h-position, above that it amplifies the signal up to +6dB. This parameter is voltage controllable.
The Feedback parameter adds even more self-oscillation and a more aggressive, squelchy charachter. Its both modes color the signal in different ways and the feedback amount is voltage controllable as well.
Pretty much the only paramenter without voltage control is the dry/wet mix which allows for parallel filtering.
audio input and output
CV inputs: 1V/oct, input level, master frequency, width, feedback, HP cutoff CV, LP cutoff CV, HP Q and LP Q
3U Eurorack module, 12HP wide, 25mm deep
current draw: 120mA @ +12V and 100mA @ -12V