Finally, there is no need to second guess your sample-peak limiter time and time again, or deliberately increase headroom to avoid a downstream problem. Now you can simply dial in your True-peak limit and let ISL take care of the rest. ISL is a transparent look-ahead limiter designed to allow you to get on with creative audio production while it takes care of True-peak compliance for you.
ISL uses the standardised True-Peak algorithms of ITU-R B.S. 1770 and related standards and is suitable for the control of audio for Post Production and Broadcast applications. True Peak limiting can also be used to ensure that down-stream Codecs (mp3, AAC etc.) do not introduce distortion into the signal.
-Loudness compatible limiting
-Protect against distortion introduced by lossy codecs
-Don't guess, set TP limit directly from the specification to ensure compliance
-Mix with your ears, ISL takes care of the rest
http://www.nugenaudio.com/ISL_True-Peak_Limiter_VST_AU_AAX_RTAS.php