This update delivers improved compatibility and numerous fixes.
Issues addressed in MainStage 2.1.1 include:
Improved stability of the 32-Bit Audio Unit Bridge
Fixed problems that caused audible artifacts when using the Playback or Loopback plug-ins
Issues addressed in MainStage 2.1.0 include:
Support for 64-bit native mode
Compatibility with 64-bit Audio Unit plug-ins
Improved compatibility with MainStage 1.x documents
Multiple Playback plug-ins in the same group now sync reliably
Improved recording when using the Loopback plug-in
Updated System Requirements
32-bit mode requires Mac OS X 10.5.7 or later
64-bit mode requires Mac OS X 10.6.2 or later
The update is recommended for all users of MainStage 2.