The Mixer is a Core Plug-In for TDM systems. A 24-bit Optimized Mixer was introduced with Pro Tools|24 systems (9/24/97), and the original Mixer was renamed "16-bit Optimized Mixer." With the 5.3 release, the 16-bit mixer was dropped and we included standard and dithered "Stereo" and "Surround" mixers.06/20/94 version 1.0 (for PT 2.5 - initial release)08/03/94 version 1.01 (for PT 2.51)11/28/94 version 1.1 (for PT 3.0)05/17/95 version 1.2 (for PT 3.1)12/08/95 version 1.21 (for PT 3.11)02/07/96 version 1.22 (for PT 3.2)05/20/96 version 1.3 (for PT 3.21)03/21/97 version 1.4 (for PT 4.0)09/24/97 version 1.5 (for PT 4.1, split into 16-bit and 24-bit)02/20/98 version 1.5.1 (for PT 4.1.1)06/23/98 version 1.6 (for PT 4.2)09/25/98 version 1.7 (for PT 4.3)11/xx/98 version 1.7.1 (for PT 4.3)04/14/99 version 1.7.2 (for PT 4.3.1)11/19/99 version 1.8 (for PT 5.0)05/30/00 version 1.8.1 (for PT 5.0.1)01/26/01 version 5.1 (for PT 5.1)01/26/01 version 5.1cs3 (for PT 5.1, fixes TDM connection prob)01/17/02 version 5.3 (for PT 5.3)