In response to requests from readers who have built the Formant synthesiser the following article presents a design for a voltage-controlled filter whose slope is considerably steeper than that of the original VCF, in fact 24 dB/octave as opposed to 12 dB/octave. The filter offers a choice of highpass or lowpass modes and slopes of 6, 12, 18 or 24 dB/octave.
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