Hi Turbo_kev !
I looked into these 3 presets and figured out why you are seeing these "double notes".
For all these 3 multi presets, it appears that one part is actually octave-shifted, some kind of transposition. Which will act like this : even if you play a C3 on your keyboard, you'll hear and see a c4.
To better understand this feature , i invite you to load "modern memories" preset. Then in the info panel on the right, you have four tabs : tracks / midi / effects / preset.
if you click on midi, it will open this tab where you can do many things like setting the range,midi channel, octave shift , transpose and so on...
You'll see that the "grey road piano" part is set on octave 0 and "elysium" on octave 1.
If you set elysium on octave 0 and then play a note on your keyboard, there will be no more "double notes".
Hope it's clear for you now.
i maybe have a clue for your < > issue, i'll answer in the right topic.
Best,