> How are you combining the 3 different channels of media?
> I tried defining 3 boxes with different colored interiors, and it seems that the
> current box seems to "overwrite" the previous box.
>
> Drat this blasted media thing !!!!
> You kids and your fancy new-fangled gadgetry.
> Never satisfied with the simpler things in life.
> When I was a kid, we didn't even have spheres to render with - we had amorphous
> rocks with whatever texture was available.  And they were all drab.
> And it was good enough for us.  AND we liked it.
>
> "Media."   Harrrumph!
>

Use a single container, a box in your case, and give it 3 medias.
Using 3 boxes is bound to give you severe coincident surfaces artefacts: 
For each individual pixels, there is no way to know which box will be 
used and you get a noisy mess.

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