I prefer a regular WM on a desktop and a tiling WM on my laptop. So if you dont have a good mice i would recommend a tiling WM. I personally use xfce and i3/sway. But i would suggest to try them for a while with a basic configuration, and if they serves you well, cofigure it to taste.
That really looks interesting. I have a similar idea for such an application in the back of my mind for some time now. This comes close to it. Another application thats worth mentioning is cherrytree.
Also the matured DAW Ardour (floss) is worth mentioning. Renoise (non free) and MilkyTracker (floss), if we allow some trackers on this list.