removing instruments from separate variations ..

[al urezzio]

if someone can explain this to me or tell of a video to help me , it would be greatly appreciate ...i've notice in styles that a bought , in each variation there are different instruments .... how do i change , lets just say , the guitar to a different sound in variation 1 but still have the sound/ guitar in any of the other variations ???? also i notice sometimes there will be a sound listed in one of the slots for instruments but nothing plays in any of the variations .. I apologize but i don't understand the programing side of these arrangers ... maybe some video tutorials MIGHT help me , any suggestions ... as always this site is a great place to get questions answered about Korg keyboards & I'm extremely thankful to all the wonderful people that freely reach out to help ...