Hi, I have a question: Are layers and stacks always attached to parts? Lets say I have 8 parts in a song, but I want the same stack or layer for the whole song, so if I for example change the sound of an virtual instrument, I dont have to do it for all parts?

See menu “Parts/Create Global Part”.
Layers and Stacks in the global part are…well, global :slight_smile:
Note there are no “Song Layers” or “Song Stacks”. The Global Part is for the entire project. However you can use virtual connections if you want to utilize those only for specific Songs or even Parts.