I'm wondering if I'm missing something...
I have loaded all instrument staves and have all sounds and notations correct except for the synth.
I originally loaded the synth sound I thought I wanted for the beginning of the show (Sci-fi-S7S), then I wanted to change to full organ sound.  When I did an instrument change to Skinner Organ Swell-S7S and text changed to full organ, I get the same Sci-fi sound. Even if I remove the text it's the same Sci-fi sound.  I had to load another staff for Skinner Organ to get the sound I want.
I'm at a point where I want to do more instrument changes for Synth like pizz strings, harp, & arco strings but I don't want to complicate things more or have to add a new staff for each sound if possible. 
Am I doing something wrong? Should I do an instrument change each time I change a synthesizer sound?