trouble with instrument changes

Good Afternoon, 


My name is Keith and I'm currently having some issues with certain instrument changes in my Sibelius scores using VDL. I have a fairly large score consisting of 21 instruments.  I have four instance kontakt 5 available.  I have programed instruments changes that work on the vibes to slapstick, vibes to vibrslap and from a concert snare to a piccolo snare.  


However....I am trying to program an instrument change from Rack Combo A & B to Thundersheets.  These are not working for some reason.  Any help would be greatly appreciate it.  


My set-up includes:

MacOS High Sierra

Sibelius 7.1

Kontakt 5

VDL 2.5

Korg Microkey


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