Version 5.0cs3 is an interim release that can be used with Pro Tools 5.0 TDM and Pro Tools 5.0 LE Systems. Preliminary testing has shown that this DAE/DSI combination fixes the following problems: Digi 001 systems - Cannot generate MIDI Time Code (MTC) from the Digi 001 MIDI Output. - Analog Inputs 2, 4, 6 and 8 are delayed by 1 sample. Analog Outputs 1, 3, 5 and 7 are delayed by 1 sample. TDM systems with DSP Farm 1 cards - Certain Plug-Ins, e.g. D-Verb, are problematic (audio dropouts or no wet signal) when loaded on the first chip of a DSP Farm 1 card. (these have serial numbers below FF09226) If you are not experiencing any of these symptoms with your current Pro Tools 5.0 TDM or Digi 001 system you should continue to use DAE/DSI 5.0