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capable of making a
            : countless number of instrument sounds. It is microtonal,
and the instruments
            : made by it sounds like those from professional
keyboards. The program has
            : effects like Reverb, Echo, Chorus, Phaser...
            :
            : This package includes the DSSI implementation of the synthesizer.

In qtractor, I noticed there was a ZynAddSubFX instrument definition
that was made available in the track-properties dialog. With this
setup, you can then select from the predefined ZynAddSubFX patches
available on ones system. Therefore the GUI is Qtractor itself, and
the patch selection is no different than any other properly setup
external synth with a cakewalk instrument definition (.ins) setup for
it in qtractor.

Niels
http://nielsmayer.com