The very popular Wavestation Synthesizer from Korg was based on the ProphetVS from Sequential Circuits. Complex sounds can be created by combing and altering digital waveforms by a method of synthesis called Advanced Vector Synthesis and Wave Sequencing synthesis. The Wavestation had 2MB of ROM based samples at your disposal. Programming is not easy but this great digital synth is capable of great ambient sounds and strange effects. It has lowpass filtering and onboard effects which are pretty nice. This synth is easily upgraded and expandable with PCM cards.