It should be "simply" bringing the channel info to the tracks. I tried a bit today and renamed the "untitled" track names in the midi editor after the names of the channel info. Started with the first ones, saved and now it works as you can see in the picture:
It works in my other daw too, so it is really that your app has to output the channel info instead of whatever in the track name to make it work.
Of course this could be kind of workaround, but as the strength of the app is to put out lots of different tracks to compare IN the daw could not be a solution. But it helps for some more testing.
The first good news: velocity randomization works :-)