The song mode has only one song (= arrangement) to work on.
What is the problem?
You cannot work on different arrangements of patterns in one project.
What do you want to achieve?
The possibilty to try out different arrangement ideas in the same project.
(or completely different songs with the same material)
Are there any workarounds?
Copy your song (‘save as’) and create a new song there.
Any links to related discussions?
Don’t think so. I checked…
Any references to other products?
Yamaha QY 700. You can work on 20 different songs without changing the
project and jumo around if you like.