syntha vcf historical


Posted on Feb 6, 2014

This module is a `tribute` module, based on the awesome Steiner-Parker Synth VCF. Those who know me will know I`m not a big VCF fan. Nonetheless, this VCF really appeals to me. Its sound is quite unlike the Moog ladder, has a lot of character. Resonance is a bit unusual in its behavior. Once it starts oscillating, the resonance pot needs to be bac


syntha vcf historical
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ked off a fair way to get it to stop again. It can also be frequency dependent. Connect the CV input to a voltage source such as a keyboard, envelope generator or sequencer. Connect the output to a VCA or amplifier. Feed the signal to be filtered into the high-pass, band-pass or low-pass input. Unlike the original, this version allows signals to be fed into all inputs simultaneously. If the same signal is used in all inputs, the result is reminiscent of a phaser. The real fun starts when you feed different signals into each input, then you get a frequency based "interpolating scanner", where panning between different sound sources is possible, though also subject to the frequency at which they are running. I have never heard an effect like it before. The circuit uses a standard, non-inverting amplifier configuration. The three modes (HL, BP, LP) are obtained by injecting the signal into three different points of the circuit. An increase in the gain of the amplifier increases the filter`s Q. The Q remains almost constant as the filter is swept across the audio spectrum. In the circuit, diode strings are used as voltage controlled resistors. The differential-amplifier transistors apply the bias voltage to the parallel diode string RC networks in opposing phase. The opposing phases cancel the control voltage so that none appears at the output. The final stage is a simple gain stage, as I found the original was too quiet for my...




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