As for parameters, the behavior is puzzling. I am not in my studio now, but was able to repeat what happened earlier without the Juno 2 present. I called up Preset 1, then altered 2 parameters, T4 (release time) and the Chorus rate. I then saved the changes into Preset 1. I altered T4 again, then called up Preset 1 again. T4 moved back to the position where I had saved it, but the Chorus rate reverted to where it had been before the save. So the problem is in how it saves data, possibly in addition to how it sends. When I was at my studio earlier this evening, I tried loading a patch manually on the synth, then calling up Preset 1 on the layout. Only certain parameters changed - it wasn't a complete set by any means.
Make of all this, what you will. Thanks!
Andy