This video takes you through how to easily create pro sounding chord progressions in studio one. The toolbar used can be downloaded here: studioonestopshop.gumroad.com... Enjoy :)
Awesome.... it now seems to do what I'd like it to do, create diatonic chords from single notes along the specified scale. Edit: I see it only works with major scales. I guess S1 doesn't yet have a way to transpose according to scale notes.