SoundHack has released Delay Trio, a collection of three plugins that Tom Erbe developed as class demonstrations while teaching computer music and studio technique at UC San Diego. All of these are 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).
• +bubbler (a granular delay in which grains are pulled from the delay line with randomized start time, delay time and pitch shift value).

These plug-ins are available for Windows (VST, RTAS) and Mac OS X (VST, RTAS, AU); all are freeware.

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