Gig Performer 3.x and 4.x documentation links.
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The latest user manual is here. You can also access it from the Gig Performer menu: Help -> Documentation.
Gig Performer 4:
Gig Performer 4.8 User Manual: LINK
Gig Performer 4.7 User Manual: LINK
Gig Performer 4.5 User Manual: LINK
Gig Performer 4 GP Script Language Manual: LINK
Gig Performer 3:
Gig Performer 3 User Guide: LINK
GPScript 3 documentation: LINK
Gig Performer 3 System Functions: LINK