Valhalla DSP has announced the free pre-alpha release of a new algorithm: ValhallaFreqEcho.
ValhallaFreqEcho is a bode-style frequency shifter + analog echo emulation. Sonic results range from subtle chorusing and double tracking to barberpole phasing and flanging to runaway echos spinning through your skull to endless glissandos. Perfect for those Dr. Who sounds, dub and all of your psychedelic needs.
ValhallaFreqEcho is available as a VST effect plug-in as a "pre-alpha" for Mac OS X and Windows. A Mac OS X AU version is coming soon plus a GUI will follow offering more controls and finer tuning abilities.