The Pat file stands for patches. It's a complete patch list that has been converted from the Cakewalk standard .ini file to PG's format. All you do is install that Pat file in both Biab and RB and then when you want to select a SC patch for a midi track they're all there in the dropdown menu. There a vid that explains how it works.

Bob

Biab/RB latest build, Win 11 Pro, Ryzen 5 5600 G, 512 Gig SSD, 16 Gigs Ram, Steinberg UR22 MkII, Roland Sonic Cell, Kurzweil PC3, Hammond SK1, Korg PA3XPro, Garritan JABB, Hypercanvas, Sampletank 3, more.