The SoundCode Stereo LtRt Upgrade is for owners of the Digidesign Complete Production Toolkit which includes the SoundCode Stereo plug-in. An iLok with a SoundCode Stereo license is required for the upgrade. SoundCode Stereo LtRt is a surround encoding and down mixing plug-in for Pro Tools. It is designed for post-production studios, TV mixers, video game mixers, and broadcasters that monitor or deliver downmixed and Lt Rt encoded audio compatible with Pro Logic™ decoders used in homes worldwide. It features: TDM, RTAS, and Audiosuite operation, Pro Logic™ II compatible matrix encoding, Pro Logic™ I compatible matrix encoding, Lo Ro non-matrixed down mixing, mute and phase controls, mix level controls, brick-wall limiting, flexible metering. ILOK LICENSE ONLY VALID FOR AN ILOK WITH AN EXISTING SOUNDCODE STEREO LICENSE.