We have an Alpha script for Reason and the Base here:
There's a README that tells you where to install, and a PNG file that describes the functions of the Base controls.
A short demo video is on youtube: http://youtu.be/7Q_xxTz2wRc
Feedback appreciated!
These features are hardly set in stone. Hell, some aren't even implemented yet!
The mappings for the sliders are based on a Propellerheads example template. We haven't dug into that wormhole yet, we just wanted to get things functioning.
In case you are curious about which 8 modes/scales are implemented, we have:
'Major','Minor','Dorian','Mixolydian','Lydian','Phrygian','Chromatic','DrumPad',
There's many more available. You can edit line 40 in Base.lua and put whatever 8 scales you are interested in as the first 8 items in the "scalenames" array.