For macOS users
How to start multiple instances on computer startup → LINK
Launch individual instances from the Mac menu bar/script menu → LINK
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How to start a Gig Performer instance from the Terminal:
open -n /Applications/GigPerformer4.app --args -in=INSTANCE-NAME
Note: replace “INSTANCE-NAME” with the name of your instance.
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Applescript for Activating GP4 + Instances → LINK