What is the effect used at the end of this little clip?

http://www.vipzone-samples.com/deta...tuned_stack.mp3

(at 30 seconds it starts)

is there a free vst effect plugin which can do this?

thanks

Sounds like a Trancegate with an Lfo automated any synth with a built in trancegate will do the trick or..

http://www.camelaudio.com/camelspace.php

do you know of any free vst effects that can do this?