I was thinking of having a "track" mode for easy, as shown crudely above. It shows the path from beat to beat, when to strike for a 300, perhaps could instead show a range (going from 50 to 100 to 300 to 100 to 50) instead of a dot for when to hit. Sliders should be shown differently, which I don't have in this mock up. Spinners should be something else too, maybe just gigantic arrows pointing both ways on the spinner. Track ball should also have an arrow that points the direction of the next beat.
This mode would not make hard songs easier by much. Instead, I think it will serve as a tool to help newbies at the game. I recommend a multiplier over .50 at least.