Similarly, amplifier distortion and compression can't be emulated using conventional convolution. You could for example, use it to model the response of a favourite equaliser setting or even a guitar speaker cabinet, and it will also sample delay effects (including hardware reverb devices that don't use internal modulation), though anything that uses modulation, such as chorus, flanging and vibrato, can't be captured this way. Like most convolution devices, Altiverb can also be used to sample other linear processes, by which I mean ones that don't include time envelopes, pitch modulation or distortion. The included Altiverb IR Pre-processor is a separate software application that allows you to use sine sweeps, balloon bursts or starting-pistol shots to sample your own spaces. Normally you work from a library of impulse responses recorded in concert halls, studios, clubs and other acoustically useful places, but it is also possible to create your own. These days, however, we can take advantage of what they have to offer without trading that off against the use of other plug-ins. All convolution-based reverbs are extremely processor-intensive, and back in 2002 when the Mac G4 was the epitome of power processing, running a convolution algorithm ate up a lot of the available processing power. Since we first reviewed Audio Ease's Altiverb Mac-based convolution reverb plug-in back in 2002, many more convolution-based plug-ins have sprung up, but Altiverb still has a reputation for sounding a little bit special.
Altiverb was one of the first convolution reverbs.
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