Been around for years, first saw it in the late 80s used with organ and synth, difficult to master, but if you do, it adds a whole new level of expression.
Here is one http://www.mrtaudio.com/?gclid=CLzbpb3Yj9QCFQEA0wodAv8FTg there are others.
Bill
_________________________
English Riviera:
Live entertainment, Real Ale, Great Scenery, Great Beaches, why would anyone want to live anywhere else (I�m definitely staying put).