Gig disks are essentially nothing more than 3rd party style files that have been renamed with appropriate song titles that fit that particular style. You'll find the ones I put together and those of several other folks at
PSR Tutorial.com Gary
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)