The ++delay gives you classic delay effects, with a wide ranging filter section to help emulate vintage delays, an LFO time modulator with triangle, sine, ramp, square and random waveforms, as well as freeze mode, dual-head mode and feedback inversion. Both the delay time and the LFO modulator can be synced to multiples and divisions of the host clock.
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The algorithm consists of 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 retro. The saturating feedback also allows them to be great drone and noise generators.
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The ++chebyshev is a distortion unit which uses several low-order chebyshev polynomials to add even or odd harmonic distortion. This can be used to make a sound gently saturated (3rd chebyshev polynomial), harshly distorted (7th chebyshev polynomial) or like a dying amplifier (2nd or 4th chebyshev polynomials).
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