Here's a quick way to correct plugin auto-tracking issues when opening older 72 chan sessions in the new SAC 4.0 120 chan environment.

Plugins patched past chan 72 in the old session will not recognize that they were Return and Output chan patches... they will simply be now seen as input xxx up to 120.

The fix is easy... use the Store/Recall option menu... Alt-Right-Click on the Return chan... Store All to Mem Cell 01... then just Recall FX from Mem Cell 01. Then when you pop open the plugin, it should correctly identify itself on the Return chan... Do the same for Out chan plugins... then re-save the session. This method will retain all plugin settings, so you should not have to make any further adjustments.

You only have to do this the first time you are moving an older session into the newer environment.

Bob L