Version 3.2 is a disaster
After updating to this version, MainStage now no longer saves external instrument inputs. You can assign an external instrument to an input channel, save the concert, quit MainStage, and when you reload the concert all of your inputs are defaulted to no input. Also have problems now with CPU overload messages, even on concerts that do not have any plug-ins on them. Just plain audio routing. Avoid this build if you are a working musician.
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MainStage