Xsynth an analog-style (VCAs-VCF-VCO) synth plugin

The xsynth-dssi package contains the Xsynth-DSSI plugin, a classic-analog (VCOs-VCF-VCA) style software synthesizer with an editor GUI. Xsynth-DSSI was written by Sean Bolton, and was based on Steve Brooke's Xsynth code, but has since aquired polyphonic operation, band-limited oscillators, a better filter mode, and velocity-sensitive envelopes. Author: -------- Sean Bolton <sean@smbolton.com>