This document introduces cesSynth2, a VST2 plugin which models a drawbar organ. The synth offers the following features:

A free version of the plugin can be downloaded from here for Macintosh and here for PC. The plugin comes with a default sond bank. The free version is released under the feedbackware licence agreement. In addition, a version can be purchased for $20 from here which adds sample accurate sync.

If you have any comments of this documentation, or the plugin, please contact me.

Optimising the synth performance

It is possible to configure cesSynth2 to produce some very complicated sounds. Some aspects of the sound are computationaly expensive, and similar results can be achieved with significant performance savings.

The synth operates in the following modes:


PIII/500 G3/400


No detune or pan


With the Pan Rate and Pan Depth set to 0, and the Tune Rng and Tune Lvl set to 0, the no detune or pan mode is selected, which offers the most polyphony.

No detune with pan


Tune Rng and Tune Lvl set to 0.



No pan, but individual drawbar detunes used.

Detune with pan


All synth features used.

From the above table is should be noted that there are significant performance gains to be had from not using detune, and not using pan. If a very simple pan is required (the same pan position for all drawbars), an external plugin can be used to provide this facility. This will offer better performance than the internal pan effect, since this calculates the pan for each drawbar separately.

It should be noted that the use of percussion, click or the ADSR filter do not affect the synth mode, or the synth performance.


Synth Controls