voc-two is a free software synthesizer developed by Simple-Media. Available format(s): VST for Windows.
Voc-Two allows you to create realistic string ensemble and choir sounds without the use of samples. It includes a wide range of controls over the source sound generation and the morphable formant filter making it a surprisingly flexible instrument for creating rich and atmospheric pads and realistic ensemble sounds.
http://www.simple-media.co.uk/vsti.htm
