the intl outdoor 17mm driver is so close, yet so far, as far as mixing goes 
group b will allow a 2 colour mix and a white+1 color mix, unless you forego the white die altogether
not really extending the spectrum by much now…
Aside from some photography fun I don’t need to mix the colours. If I did need to I’d buy two 
Here’s Vinh’s YouTube video
I'd love the possibility of colour mxing, and best if it uses ramping different dies up and down to go through the colours. The UI of this 17mm driver is very very primitive, not well thought out, with this driver and just different software it may have much nicer possibilities I think (sounds like a Dr. Jones project??).