Altiverb 6 is a convolution reverb plug-in for Mac OS X and Windows XP. It offers the most extensive set of parameters, it supports all professional plug-in formats, parameter automation and surround. Altiverb 6 gives you a choice between iLok SmartKey or Challenge/response copy protection, it lets you sample your own spaces (currenty Mac only), and Altiverb is efficient on your cpu.