Digital Reverb The PCM 90 gives you Lexicon's renowned high-end reverb effects with a powerful new interface that provides easy access to superbly crafted presets as well as a wealth of programming capabilities for the sound designer.The PCM 90 contains a built-in library of 250 reverb effects that simulate realistic halls, rooms and plates, and let you create completely natural, or other-worldly spaces. The presets are organized into 5 Banks of 50, and are functionally grouped for different applications. Be sure to experiment with all 250 presets to get a feel for the full range of PCM 90 capabilities.