This document introduces cesSynth1, a VST2 plugin which models a flexible analogue synthesiser. The synth is a dual oscillator design, incorporating a fourth order resonant low pass filter. The model features:
Polyphonic - up to 32 notes can be played, with a polyphony limiting control
Dual oscillators, with selectable octaves
Three oscillator waveforms (variable pulse, variable saw and triangle), which can be combined to produce complex composite waveforms for each oscillator.
Three modulation sources (LFO, and two complex envelope generators).
Fourth order resonant low pass filter.
The following controls can be modulated - frequency of each oscillator, VCA for each oscillator, VCF cutoff frequency.
A custom GUI
Monophonic, polyphonic and Arpeggio operating modes.
The frequency of each oscillator is based on the fundamental of the note played, and the status of the pitch bend wheel. This base frequency can be modulated by the modulation sources, and Oscillator 2 can also be modified by a constant offset. The modulation sources will be described later. Each oscillator provides three basic waveforms - pulse, saw and triangle. There is a width control for the pulse and saw waveforms which controls the amount of time spent on the first half of the cycle (positive for pulse, and rising for saw).
The width control can therefore vary the saw waveform from a falling saw (0%) through a triangle (50%) to a rising saw (100%). The waveform of each oscillator can be built from a combination of the three basic shapes, with variable amounts of each waveform. The GUI provides visual feedback of the resulting waveform shape.
Having been amplitude modulated, the combined output of the two oscillators is fed to the filter stage. The filter is a 4 pole low pass design, with resonance ...
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P A N Z E R T A N K P M 4 p h a s e m o d u l a t i o n s y n t h:
Panzertank PM4 is a virtual phase modulation synth very much
like the famous FM synthesizers. It has four sinus operators
(oscillators) with individual APDSR envelopes, detune and
velocity sensitivity. There are six schemes or algorithms to
construct the sound.
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