I thought this still needs a bit of clarification, as it was confusing me. When multiple sound fonts are loaded into an engine, the first one with the given bank and channel is the one that is played. As I wanted to create an engine using different instruments from different soundfonts, what I needed to do was to edit each sound font so that it had a different bank number. (Any sound font editor should do that for you). I could then select them using the bank selection when setting up my channels.
I thought this still needs a bit of clarification, as it was confusing me. When multiple sound fonts are loaded into an engine, the first one with the given bank and channel is the one that is played. As I wanted to create an engine using different instruments from different soundfonts, what I needed to do was to edit each sound font so that it had a different bank number. (Any sound font editor should do that for you). I could then select them using the bank selection when setting up my channels.