Some neat ideas here! I think to do it user friendly and logical a mixer has to be "open" to possibilities.

Mario +10!!!

VideoTrack,
Yes, logicaly sound.... but having a "freeze" option on individual regenerated track would allow to use the segment on particular bars or not simply by going to "bar option" and do mute/unmute thing. It would solve many requests in "one" feature.

For that to happen "easy" way, for user that is, re-generations should reside in individual "subtracks" of the mixer. Clearly visible and available for Mute/Unmute/Solo/Freeze operation. So it does not take too much space, collapsible? In the same way you showed a concept of collapsible mixer some time ago.


Pipeline,
Why on the bottom? Why not Sub-tracked to original mixer track they were generated from? And as I mentioned in "wishlist" request, do these "regenerations" on request. One click "+" gives you next regeneration in sub track, leaving original (or previous) in place. For example
2962: organ, rhythm...
Next Regeneration would be created as subtrack with name lets say:
2962: R1 organ, rhythm...
2962: R2 organ, rhythm...
etc.