Need help @ mixture machine

[kosta081287]

OK but how did you know where 4 starts.??4 sepused to be on the right side but in your post it shows its the left.God its so confusing i tried:

1-2-3
6-5-4 which was resnobale according to the note but how did you get

2-1-6
-4-3-2

just wondering.In the note there was nothing like that