Unless I misunderstood what you mean you can do this.
Simply mute scene A, move crossfader to B, set the 16 scenes with fx and synthesis parameters, leave crossfader at scene B when you wish to access any of the 16 scenes, and use the trig buttons with B held to select which one is active. To turn a scene off simply either mute scene B or move fader to A (which was muted).
Is that going to do what you want?
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