sorry i'm talking from the perspective of turning drum fills off. was curious if a chart can be made where only that last green gem can show up in place of a charted green gem. so overdrive or not the song is true....don't really like the songs were there is a forced green gem in the middle of nowhere to activate it...
i assume this is a yes cause there are a bunch of harmonix songs that do so....was just curious with all the overlapping and just slightly off double green gems...
Well the slightly off double green gems are very likely the kind of charting mistake I mentioned previously
I am still not sure if I understand your question, but at least I can say that when you turn the drum fills off in-game, then all the drums notes charted in the midi file under the drum fills marker show up in the screen (and the game expects you to hit them all for scoring), while with the drum fills on then the game shows all the lanes colored and allows you to bang freely on the drums and create your own fills.
But if I understand correctly, in both cases the "special, overdrive-activating" green gem at the end of the drum fill section is shown anyway.
I have actually always charted a green gem just after the end edge of each drum fill marker in my customs, so I don't know what happens if you don't chart that gem, or if you chart a gem of a different color, or multiple gems at that location... I was under the impression that the game assumes every drum fills in the history or rock ends with a crash, which obviously is not the case but is a simplification made by the game designers to keep consistency in the way for activating an overdrive.
I certainly agree that authors should not add non-existing notes to their chart! Although now I wonder if Magma actually requires at least one drum fill in the song... if that's the case, then I don't know what I would choose to do if I ever stumble upon a song where the drums absolutely don't have even one single bar that can be reasonably marked as as a drum fill.