SQ80-emulating VSTi available!
http://itec.uka.de/~buchty/sq80/sq8l/sq8l.jpg
The SQ8L is a software (VST) model of Ensoniq's classic 1980s
   synth SQ80. The SQ80 features 3 digital wavetable oscillators
   for each of its 8 voices which are fed through analog 4-pole
   lowpass filters (-24dB gain) with resonance. Sound parameters can
   be modulated by 4 envelopes, 3 LFOs and several MIDI sources.
   The SQ80 also has a predecessor, the ESQ1, which can do most of
   the same stuff.
   Although the technology may seem obsolete, these synths can
   produce a wide variety of interesting and extremely usable sounds.
   Thanks to the lo-fi oscillators and the analog components it can
   sound very digital and dirty, but also very analog and warm.
   Which is a good thing because modern synths often tend to sound
   rather clean. Now you can experience this great classic synth
   with the SQ8L!
http://itec.uka.de/~buchty/sq80/sq8l/SQ8L-v0.8a.zip
http://www.buchty.net/ensoniq/