ORCA is an experimental monosynth built to showcase some exciting new technology that we've been developing. Based on detailed and accurate models of analogue synthesizer circuits and components, ORCA excels at deep, squelchy basses and thick unison leads.

This one needs registration in order to dl but here are the direct links that worked for me:

PC version: http://www.fxpansion.com/downloadx.p...amp;platform=w
OSX version: http://www.fxpansion.com/downloadx.p...mp;platform=mi

Homepage:
http://www.fxpansion.com/index.php?page=12&tab=60