For instance, by mapping the input level of the signal to the position in the kernel array, you can reproduce level-dependent processes such as compression or distortion, while scrolling backwards and forwards through a kernel array using an LFO reproduces cyclic sounds such as chorusing and flanging. It processes lots of these kernels at once, and then, rather like a wavetable synth, can scroll through an array of slightly different waveforms to morph them, using a ‘vector engine’ controlled by LFOs, envelopes and so on. Nebula’s convolution technique is based on ‘Diagonal Volterra Kernels’ in effect, tiny instantaneous snapshots of real-world effects. Until now, non-linear convolution was only available on hardware products such as Focusrite’s Liquid Mix, while, to my knowledge, time-variant devices have never before been captured using this method. Not only can it capture the dynamics of non-linear devices such as compressors, but also ‘time-variant’ processors such as chorus, flangers and phasers. The free taster version of this plug-in, which I discussed in May 2007’s PC Notes, has created a lot of interest, since it seems to do what we were previously told was impossible. But when that plug-in arrives with a 6GB convolution library emulating several hundred items of vintage gear such as preamps, tape machines, compressors and chorus/flanging effects along with the more usual equalisers, filters and reverbs, you sit up and take notice. You might not expect a single multi–effect plug-in to warrant an in–depth SOS review. Convolution technology has provided new levels of realism for plug-in reverb, but has been unable to capture non-linear or time-variant effects such as compression, tape saturation, distortion and flanging.
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