Could you explain in a little more detail? I'm not familiar with "ROT key". User scale I'm guessing you mean micro-tuning but maybe you're referring to something else.

I use one setup user scale for more intonation, in order to get dual voices ... for my music ... I need make a video to explain more easily what it is about ...

But montage iz realy great machine!
if this would be resolved around the user scale and maybe later the Legato function ... the sint is perfect ...

I'm working today, I make comparative video tomorrow