Crystal is a semi-modular software
synthesizer featuring both subtractive synthesis and
frequency modulation (FM) synthesis.
It offers abundant modulation
control with over 60 parameters which may be
modulated, multi-stage envelopes with graphical
editors, extensive tempo sync of envelopes/lforates/delay
times, built-in effects for chorus/flanging/comb
filtering/echoes, and a band splitter for effects
processing by frequency band.