Altiverb is a sampled acoustics processor that offers realistic one-, two- and four-channel sampled acoustics of real halls, cathedrals, bathrooms — and virtually any acoustic environment. Included in the release are dozens of presets ranging from the Amsterdam Concertgebouw to the back of a Ford Transit van, all of these can browsed online and downloaded from www.audioease.com/IR .
Altiverb provides mono-to-mono, mono-to-stereo, stereo-to-stereo, mono-to-quad, and stereo-to-quad effects, making it ideal for surround reverb and ambience applications. All processing is done in real time.

An Altiverb preset is called an 'impulse response', which is created by firing a starter pistol or by playing a sine wave sweep from a speaker in an auditorium, church, or other acoustic space. The resulting reverberation decay is recorded as a digital audio file. Using a process called deconvolution, the dry source signal is then extracted from the audio file, leaving behind the exact acoustic fingerprint of the space. The impulse response file is then placed in a folder, to make it appear as a preset inside the Altiverb plug-in, where it can then be applied to any audio signal as real-time reverb. The result is a true reproduction of the sound of the acoustic space. Unlike reverbs of the past, which attempt to synthesize decay characteristics, Altiverb captures the actual acoustics of a particular environment