The online user manual for GPO5 lists percussion patches, https://usermanuals.garritan.com/GPO5/Content/directory.htm#percussion, very nice!  World Instruments pdf manual also lists percussion patches.  COMB-2 and JABB-3 do not have that, so first you have to search for a percussion sound, then guess what it is.  For example, JABB / Drums and Persuccion / GM Drum Kits / GM Fusion Drum Kit / D#5 - F5: Are those Claves, Woodblocks, or a combination, or something else?  It is necessary to know exactly so I can assign those instruments to human musicians.  Certainly a patch list was used to build the drum kits.  Please publish percussion patch lists for COMB-2 and JABB-3, or advise where I can find them.

Thanks - Brad