SoundHack has updated the Delay Trio, a free collection of three plugins created by Tom Erbe and originally intended for personal use in the studio or to illustrate concepts (+decimate, +chebyshev) or techniques (+delay, +bubbler, etc.) to his computer music programming class.
SoundHack Delay Trio is a group of three plugins derived from the same basic delay algorithm: a hermite interpolated delay line with variable modulation, and a feedback loop with dc blocking and saturation. Pitch shifting is achieved with a dual head crossfading delay (ala Eltro Tempophon/Dennis Gabor/Pierre Schaeffer phonogene) and is decidedly low-ﬁ. The saturating feedback also allows them to be great drone and noise generators.
The three plugins are +delay (classic delay effects), +pitchdelay, (essentially the same plugin with controls oriented toward pitch shifting), and finally +bubbler (a granular delay in which grains are pulled from the delay line with randomized start time, delay time and pitch shift value).
Delay Trio Bundle is available as free download for Windows and Mac.