So... the robots and roboport sounds were bothering me, that made me replace them with something that i'd rather listen to 24/7 than the original.
I just replaced the sound files in the base/sounds folder, but then I realised I could have made it as a mod instead.

However I couldn't do it, I ...

Setting what goes in which slot does not help. I could change the configuration of my train arround the limitations, thus making it work, but i'd rather not if possible.

Currently I have the train go through my iron mining station, then go to the copper mining station, then to the coal mining ...

Is it possible to control how much ore/metal/coal/etc goes into a train per wagon using wires and smart inserters? If not, is there another way to do something like this?